I recently bought a 10-pack of these on special from ICStation. They are advertised as working from 2.5 to 5 volts but they do not. Pretty much anything less than 4.75 volts will cause the module to latch on. The problem is that the unused pads on the board are for the sensitivity adjustment. The data sheet for the IC on this board says that the capacitor normally connected in that spot should be between 0 and 50pf with the lower values increasing sensitivity. I was able to get the board to work down to less than 2.5 volts by adding a 22pf capacitor between the blank pads. It also worked with a 47pf capacitor I had in my junk box. Yes, the sensitivity is reduced but it is still good. Shorting the pads together (0 pf) did not work.
Your video has been very useful and well explained about the touch module TTP223. I found it very useful. Thank you very much! I've brought 30pcs of them. I'm planning to use it as a switch board for me room.
This is probably the closest to what you are looking for but I don't think they latch so you'd need a second chip to do that functionality ebay.us/x6KBI0
I can't seem to get this to function as an on/off switch. It always starts out energizing the circuit as soon as I connect the battery. Maybe it's not meant to do that and I misread its specs. Any ideas?
You may need to read the datasheet and solder two of the pads on the back together to invert the power up state. Also it goes without saying if you are touching the sensor when it turns on you could be screwing up the auto calibration and getting it stuck on
very useful video. can anyone guide me as to will it work for driving a 12v relay to make it toogle between NO and NC modes? Since i am a noob in electronics a schematic will help me to implement the thing by soldering which I can do well by reading small circuit diagrams
Never really tried to place sensors very close but I'd guess you'd have to leave a few mm. It'd be easy to mock up a test by taping the sensors onto cardboard and moving them closer and closer till they detect incorrect presses.
I would really only drive loads that consume less than maybe 20mA so if your piezo module works at low current then yes. If not then you will need an additional resistor and transistor to switch higher current loads.
Im wondering at what distance it will react, since I'm thinking of making a light with a touch switch. But the thing i want to make needs the switch to be in the middle of the light diffuser, so i would like it be as far from the diffuser so it won't cast a shadow from the light that will come in from the side, ( think if a circle with the switch in the middle and the leds following the inside wall of the circle)
From my testing you can probably sense through something like 5mm or so before it gets too insensitive. The thing is though that it needs to be solid material as airgaps will drastically cut down on sensing distance. I imagine you could mount white paper behind the side lit acrylic light pipe and then mount the touch sensor to the backside of the white paper so that light is effectively reflected to the front while maintaining capacitive coupling of the sensor to the front of the acrylic surface. Obviously rigging up a prototype to test is the only way to know for sure.
could you use this to toggle connecting the "red wire" for the GBA backlight mod? from what I understand, that wire brightens up the screen, so I was thinking I could incorporate that into the mod as a brightness toggle
EMCvids If you measure the voltage of that pin and it's over ~2.2V and wire the touch sensor so that it is supplied with that voltage and its output connects to the red wire it should work.
Yeah, you would just scratch a bit of the soldermask off the top to solder a wire on there and then solder the other end on a bigger piece of metal foil/pcb plane (it would work better if there were an insulated ground plane right under of course). Now there is a physical limit to how big you could make it before the sensor couldn't read it correctly but that would take some experimentation.
Hey man nice vid just one question. Can you expand the “touch” surface area??? Maybe if I put a foiled paper sheet on top of the sensor can expand the capacitive area?? Best regards
To get a larger touch surface you can scrape some of the solder mask off the top of the sensor pad on the pcb to solder a wire to attach a larger metal foil. There is a limit though before it gets too sensitive and falsely triggers randomly.
sjm4306 I’ve been trying to work with a “sensitive wall” and I’m trying to build a grid with bronce tape to transmit the sensitive area and trigger a light. Is it posible to use this sensor to proof the concept?? What do you think??
Hi I just bought the button, can this be used to replace a normal switch? I want it to replace the buttons of a music player board, so I dont need it to give power just act as a bridge. Thanks!
It can replace a regular mechanical switch for digital circuits (not analog ones or ones where it connects two wires) but since it is an active touch sensor it does require 5v for powering it. You'd need to measure the original switch first to see if it is active low or high first.
This is really amazing. But how do you attach it to a flat surface? I mean the soldered pins will have to push the surface to attach it to it? Can you explain?
hari bukke Prasad I soldered the pins just so it would be easy to breadboard it for demonstration. For a real world application you would solder wires from the other side and make sure it was perfectly flat where you want to glue it.
hari bukke Prasad I've used double sided sticky tape and it works great. Hot glue also works fine but is obviously harder to remove. Ideally the glue should be a thin layer between the surface and the top of the touch sensor so as to capacitively couple so it can sense your finger on the other side.
Hello, I bought 40 pieces of TTP223, but I have a big problem. A 1 W led (3v x 300m) does not illuminate enough. It is powered by a LI ION battery of 4.10 V. The final voltage that reaches the led is 2.26 V. I tried with 5 V, almost the same problem, only the LED illuminates a little more, but still not enough . I use the B system. What can I do? Thank you very much!
The output of the ttp223 is low power so you need a transistor between it and the led. Google 1W LED transistor Arduino smd it will give you circuits you can use.
Hi, I have a 3 flashing led 3v on a normal button switch, how would you recommended replacing the normal switch with this touch sensor. Your help is hugely appreciated. Thanks.
Kevin Anthony If your led flasher is low enough current then you could supply it directly from the output of the touch sensor. If not then you will need a transistor to switch power to the flasher on.
sjm4306 Thanks for your quick reply, but Sorry I'm brand new to electrics! The switch is just one wire in, one out, easy, the touch switch has three out puts, what would go where?
Kevin Anthony I would really need to see the circuit board to help. The touch sensor has three pins for 3v positive and negative and its output which can be set to momentary or toggle. The way you would use it depends entirely on how your led flasher is wired.
Kevin Anthony Oh that's simple. So to use the touch sensor just wire battery positive and negative to the sensor and the output goes the led positive and led negative goes to battery negative.
enes sabanovic I have actually done exactly this and it worked great. On the front where the text "touch" is written you can carefully scrape away the insulating soldermask and solder a single wire. Then just attach the wire to any conductive surface and touching it will trigger the sensor!
Thanks pal. I have an aluminium box with some led lights on it that I need to be able to turn on/off. I can't alter the look of it in any way so adding switches is out of the question. It has some screws that can be isolated from the rest of the box. Do you Think it's possible to use this TTP223 and connecting a wire to one of those screws to act as a touch switch? The Three leds are 2,1v 20mA each. Do you Think this would work? I have no clue about Electronics as you can probably tell :P
enes sabanovic No problem. I would guess this chip itself couldn't supply enough power for more than one or two small leds and it would likely be dim. You can always wire it temporarily on a breadboard to test but you might end up needing a relay or transistor if you want more power. To find out how to wire these Google image search transistor or relay led circuits.
Gamingskull HD Yeah that would be possible but by that point you might as well play on a phone or tablet and use touch screen controls. Actually you just gave me an idea ... probably a bad idea but it must be explored ...
StellaCharlie What was it specifically that you don't understand? It'll be easier making a beginners video if I knew what areas to spend more time explaining.
The thing I didn't understand is that you didn't show the circut on the bottom of the bread board so I got confused with what wires are connected. The project I'm trying to make is having the touch sensor toggle LEDs in a gameboy color to make the atomic purple shell light up.
The sensor can store 162 prints. You'd have to be careful about state and federal laws concerning privacy as you will be essentially recording biological info about whomever it scans and will likely need signed consent.
This is a logic level device so probably not more than 10-20mA. If you want to switch a heavier load with this you will need to add a transistor, solid state relay, or mechanical relay.
Sounds like an interesting project. I don't see why it wouldn't work for your application and they are certainly cheap enough for you to get a few to prototype a test device.
I've seen them on ebay and aliexpress for around that price but you're gonna have to wait for the slow boat for them to arrive. If you aren't in a hurry then sure that's a great option, but if you need them yesterday then you wont get them that cheap and you'll have to pay for convenience. It's just the way these things work.
Can we really not argue over this. There are tons of etymological references on why people in certain regions of the world say this word the way they do. I respect that you pronounce it the way you do, please respect that I pronounce it differently. I care infinitely more about whether someone has the skills and knowledge of how to solder than arbitrarily how they pronounce the word. Let's unite for our interests in this hobby and not divide over our differences.
![Seungmin "그렇게, 천천히, 우리(As we are)" | [Stray Kids : SKZ-PLAYER]](http://i.ytimg.com/vi/kAzmhLHePqU/mqdefault.jpg)
I recently bought a 10-pack of these on special from ICStation. They are advertised as working from 2.5 to 5 volts but they do not. Pretty much anything less than 4.75 volts will cause the module to latch on. The problem is that the unused pads on the board are for the sensitivity adjustment. The data sheet for the IC on this board says that the capacitor normally connected in that spot should be between 0 and 50pf with the lower values increasing sensitivity. I was able to get the board to work down to less than 2.5 volts by adding a 22pf capacitor between the blank pads. It also worked with a 47pf capacitor I had in my junk box. Yes, the sensitivity is reduced but it is still good. Shorting the pads together (0 pf) did not work.
Tom Lillevig Thanks for the info, it will surely come in handy for future projects!
What does it mean that it will "latch on"? I was thinking I would use it with 4,5v but maybe I should use 6v in stead.
Oh no.. I ordered only ic without PCB.
Your video has been very useful and well explained about the touch module TTP223. I found it very useful. Thank you very much! I've brought 30pcs of them. I'm planning to use it as a switch board for me room.
If you make a video after you are finished, post a link here!
How us ur switch now
How to use this ttp223 touch module to a micro switch so that the switch is on/off with the micro switch.thanks
Hello! Any change there is a magnetic version of this module? Bring a magnet close to the module, it turns it on or off and stays that way?
Thanks!
This is probably the closest to what you are looking for but I don't think they latch so you'd need a second chip to do that functionality ebay.us/x6KBI0
I can't seem to get this to function as an on/off switch. It always starts out energizing the circuit as soon as I connect the battery. Maybe it's not meant to do that and I misread its specs. Any ideas?
You may need to read the datasheet and solder two of the pads on the back together to invert the power up state. Also it goes without saying if you are touching the sensor when it turns on you could be screwing up the auto calibration and getting it stuck on
Thanks for your awesome video project, looking forward to your more awesome videos. ^0^
Awesome stuff... didn't know they make modules for this. Might be interesting in future projects :)
Dear can u tell me . Which transister relay can consume least self current and it can handel upto 2 to 3 aml current or more.
very useful video. can anyone guide me as to will it work for driving a 12v relay to make it toogle between NO and NC modes? Since i am a noob in electronics a schematic will help me to implement the thing by soldering which I can do well by reading small circuit diagrams
Did you ever found an answer for your question? I would like to know as well.
How close together can you put 4 of these on the same surface (glass) and get individual response?
Never really tried to place sensors very close but I'd guess you'd have to leave a few mm. It'd be easy to mock up a test by taping the sensors onto cardboard and moving them closer and closer till they detect incorrect presses.
Can i replace this circuit to piezo drum module?
I would really only drive loads that consume less than maybe 20mA so if your piezo module works at low current then yes. If not then you will need an additional resistor and transistor to switch higher current loads.
Ok..good info..thanx bro..can u build the switcher..
Im wondering at what distance it will react, since I'm thinking of making a light with a touch switch. But the thing i want to make needs the switch to be in the middle of the light diffuser, so i would like it be as far from the diffuser so it won't cast a shadow from the light that will come in from the side, ( think if a circle with the switch in the middle and the leds following the inside wall of the circle)
From my testing you can probably sense through something like 5mm or so before it gets too insensitive. The thing is though that it needs to be solid material as airgaps will drastically cut down on sensing distance. I imagine you could mount white paper behind the side lit acrylic light pipe and then mount the touch sensor to the backside of the white paper so that light is effectively reflected to the front while maintaining capacitive coupling of the sensor to the front of the acrylic surface. Obviously rigging up a prototype to test is the only way to know for sure.
could you use this to toggle connecting the "red wire" for the GBA backlight mod?
from what I understand, that wire brightens up the screen, so I was thinking I could incorporate that into the mod as a brightness toggle
EMCvids What does the red wire normally get soldered to?
a leg of what looks like a transistor..? it's labeled DA1
gbatemp.net/attachments/cam00215-jpg.9843/
EMCvids If you measure the voltage of that pin and it's over ~2.2V and wire the touch sensor so that it is supplied with that voltage and its output connects to the red wire it should work.
I assume the ground is also needed, right?
EMCvids Yep just grab ground from anywhere on the board. You will also have to wire the touch sensor to toggle like I've shown in the video.
Is it possible to increase the size of the touchpad,
Yeah, you would just scratch a bit of the soldermask off the top to solder a wire on there and then solder the other end on a bigger piece of metal foil/pcb plane (it would work better if there were an insulated ground plane right under of course). Now there is a physical limit to how big you could make it before the sensor couldn't read it correctly but that would take some experimentation.
I have a voltage drop of 1.3 volt, is this normal? Input 4.1 volt output 2.8 volt.
Looks like two series diode drops, probably due to protection and/or the output transistor drive so likely normal.
can this still read if material was ontop of it? Or can I have it read through metal?
It will work through most materials of reasonable thickness.
Hey man nice vid just one question. Can you expand the “touch” surface area??? Maybe if I put a foiled paper sheet on top of the sensor can expand the capacitive area?? Best regards
To get a larger touch surface you can scrape some of the solder mask off the top of the sensor pad on the pcb to solder a wire to attach a larger metal foil. There is a limit though before it gets too sensitive and falsely triggers randomly.
sjm4306 I’ve been trying to work with a “sensitive wall” and I’m trying to build a grid with bronce tape to transmit the sensitive area and trigger a light. Is it posible to use this sensor to proof the concept?? What do you think??
Yeah I think given how cheap these modules are it'd be perfect to build a prototype with.
sjm4306 and for doing the wall?? Can you help me with some ideas??
Hi I just bought the button, can this be used to replace a normal switch? I want it to replace the buttons of a music player board, so I dont need it to give power just act as a bridge. Thanks!
It can replace a regular mechanical switch for digital circuits (not analog ones or ones where it connects two wires) but since it is an active touch sensor it does require 5v for powering it. You'd need to measure the original switch first to see if it is active low or high first.
If I’d put a larger capacitor on it will it be less sensitive ?
I believe there is a section in the datasheet for the chip that describes exactly that. You can adjust the sensitivity by changing one of the caps.
sjm4306 cheers mate
This is really amazing. But how do you attach it to a flat surface? I mean the soldered pins will have to push the surface to attach it to it? Can you explain?
hari bukke Prasad I soldered the pins just so it would be easy to breadboard it for demonstration. For a real world application you would solder wires from the other side and make sure it was perfectly flat where you want to glue it.
What glue can we use for attaching it? Should the glue be between the sensor and the wood or on the sides of the sensor?
hari bukke Prasad I've used double sided sticky tape and it works great. Hot glue also works fine but is obviously harder to remove. Ideally the glue should be a thin layer between the surface and the top of the touch sensor so as to capacitively couple so it can sense your finger on the other side.
Thanks for the information. It was really helpful! :)
Hello, I bought 40 pieces of TTP223, but I have a big problem. A 1 W led (3v x 300m) does not illuminate enough. It is powered by a LI ION battery of 4.10 V. The final voltage that reaches the led is 2.26 V. I tried with 5 V, almost the same problem, only the LED illuminates a little more, but still not enough . I use the B system. What can I do? Thank you very much!
The output of the ttp223 is low power so you need a transistor between it and the led. Google 1W LED transistor Arduino smd it will give you circuits you can use.
Thank you for your answer, but i am newbie in electronics. Please if you find a schematic, it would be very helpful!
Hi, I have a 3 flashing led 3v on a normal button switch, how would you recommended replacing the normal switch with this touch sensor. Your help is hugely appreciated. Thanks.
Kevin Anthony If your led flasher is low enough current then you could supply it directly from the output of the touch sensor. If not then you will need a transistor to switch power to the flasher on.
sjm4306 Thanks for your quick reply, but Sorry I'm brand new to electrics! The switch is just one wire in, one out, easy, the touch switch has three out puts, what would go where?
Kevin Anthony I would really need to see the circuit board to help. The touch sensor has three pins for 3v positive and negative and its output which can be set to momentary or toggle. The way you would use it depends entirely on how your led flasher is wired.
sjm4306 Hi, it's literally a simple led circuit, 3v power, neg to led neg and pos to led pos with switch in the way on the pos side.
Kevin Anthony Oh that's simple. So to use the touch sensor just wire battery positive and negative to the sensor and the output goes the led positive and led negative goes to battery negative.
Where do you solder the wire on module?
You'll have to be more specific about your question. I'm not quite sure what specific wire you are talking about and for what purpose.
Is there a way to run a wire from it somehow to make something else a touch Surface? A screw or something?
enes sabanovic I have actually done exactly this and it worked great. On the front where the text "touch" is written you can carefully scrape away the insulating soldermask and solder a single wire. Then just attach the wire to any conductive surface and touching it will trigger the sensor!
Cool! So what happens in case of an electrostatic discharge? Is it sensitive to ESD?
enes sabanovic Haven't looked into the datasheet in great detail but the inputs should be diode clamped to the supply rails to protect against esd.
Thanks pal. I have an aluminium box with some led lights on it that I need to be able to turn on/off. I can't alter the look of it in any way so adding switches is out of the question. It has some screws that can be isolated from the rest of the box. Do you Think it's possible to use this TTP223 and connecting a wire to one of those screws to act as a touch switch? The Three leds are 2,1v 20mA each. Do you Think this would work? I have no clue about Electronics as you can probably tell :P
enes sabanovic No problem. I would guess this chip itself couldn't supply enough power for more than one or two small leds and it would likely be dim. You can always wire it temporarily on a breadboard to test but you might end up needing a relay or transistor if you want more power. To find out how to wire these Google image search transistor or relay led circuits.
you cold build a gameboy touch were you touch the platic to controll it
Gamingskull HD Yeah that would be possible but by that point you might as well play on a phone or tablet and use touch screen controls. Actually you just gave me an idea ... probably a bad idea but it must be explored ...
the unit can be attached behind a glass?
Yep, I've tested it taped to plastic and glass with thin double sided tape and it works great.
Can you do a beginners guide for this. I️ don’t really understand this.
StellaCharlie What was it specifically that you don't understand? It'll be easier making a beginners video if I knew what areas to spend more time explaining.
The thing I didn't understand is that you didn't show the circut on the bottom of the bread board so I got confused with what wires are connected. The project I'm trying to make is having the touch sensor toggle LEDs in a gameboy color to make the atomic purple shell light up.
can i use this sensor for attendance system as a fingerprint sensor?? if yes then how many fingerprint it can store?? plzz replay
The sensor can store 162 prints. You'd have to be careful about state and federal laws concerning privacy as you will be essentially recording biological info about whomever it scans and will likely need signed consent.
how much amps can be drawn?
This is a logic level device so probably not more than 10-20mA. If you want to switch a heavier load with this you will need to add a transistor, solid state relay, or mechanical relay.
Super sir thank you very much sir
I am making a project based on women safety, so i need a wireless touch sensor. Can i use this sensor ?
Sounds like an interesting project. I don't see why it wouldn't work for your application and they are certainly cheap enough for you to get a few to prototype a test device.
Thumbs Up
I pay ~$3 for 20 of these modules. Even 75c is too much.
I've seen them on ebay and aliexpress for around that price but you're gonna have to wait for the slow boat for them to arrive. If you aren't in a hurry then sure that's a great option, but if you need them yesterday then you wont get them that cheap and you'll have to pay for convenience. It's just the way these things work.
Archive 7:00
Nice video
#electronspark
It's not Sodder! It's SOLDER. It rhymes with holder or folder. The L is not silent!
Can we really not argue over this. There are tons of etymological references on why people in certain regions of the world say this word the way they do. I respect that you pronounce it the way you do, please respect that I pronounce it differently. I care infinitely more about whether someone has the skills and knowledge of how to solder than arbitrarily how they pronounce the word. Let's unite for our interests in this hobby and not divide over our differences.