How to figure out Battery Life? Examples with trigBoard!
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- Опубликовано: 28 сен 2024
- I get this question all the time - what size battery should I use with the trigBoard?. the answer, well it depends. The trigBoard is an on-demand type of application, so battery life is going to vary depending on how many times you "wake" the trigBoard up. All of the info in this video should help you out with any battery powered application, and please keep in mind that this is all just a way to "estimate" life... there are many other factors to this, especially self-discharge. Don't think you're going to get 30yrs from a li-poly cell.
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I'm currently working on a project where I implemented a similar thing to the concept that you presented at the end of the video. I'm using ESP32 boards and ESPNOW and 802.11LR to transmit messages every second. I'm only putting chips into light sleep, but I'm managing to hit consumption of about 7mA on average. The board wakes up, gets 250ms of microphone data, downsamples it and calculates FFT and decibels, sends it and goes to light sleep.
Then I have two esp32 as a gateway. They talk with PJON through serial and It works like a charm.
As a real world example, I have a Trigboard on a door, whih opens a few times a day, with a 400 mAh cell, it has been running since the middle of January until early July, and the cell has dropped from 4.2V to 3.8V, so I reckon its good or another few months.
Since the ave. current draw is so short and insignificant, a capacitor, solar cell and boost converter could likely be used indefinitely I suspect.
you read my mind on this! I was looking into a small solar cell and a supercap combo, I estimate that a 5v 4Farad would be enough to use in a setup
I am curious what could be accomplished with a small calculator type amorphous silicon solar cell.
Hey Kevin, I was working on a project (on my channel) that was hugely inspired on your design. I used some of your tricks for my circuit and I have a great battery life. I did use alkaline for it though since I was worried that the self discharge will outweigh the operational drain of the esp8266. I figured that if it used about 5% per month, it should drain itself in about 2 years cutting my previous estimation short by 3 almost years! But now you mentioned that your batteries are over 2 years old with most of the charge in it. Still, I find lithium impractical and a bad choice for many reasons I outlined on my video for my particular case.
Also, how you managed to reduce on-time of your project? The would certainly help me a lot!
I'm really interested in creating an IoT weather sensor that can run off a battery and not have to plug in. I realize this is a very hard question to answer because of the variables but how do you account for cold and how it will effect the batteries ability to hold it's charge? This was a great video and helped me a ton!
Very informative, Thanks for sharing with us!
Hey Kevin great video and information- what I’m interested would be the gateway board to display all the Trigboards connected to it power levels or voltage on a OLED display if the gateway- can you do something like that? Added bonus would be if the gateway also logged the date, time, location of each Trigboard trigger and count - thoughts?
Nice arithmetic lesson 🤗.
what about taking a picture everytime a wake happens?
Integration with homebridge for work with HomeKit?
so my sensors: wake up every 5min, talk to wifi for 8s, average consumption 150mA = 8 days. But "solar panel" is your friend ;-) Since my sensors measure temperature in rooms they cannot sleep for more than 5min - otherwise central heating would have huge delay
120 nano pretty good
I think 5% is way too much for self discharge.
Did you ever make a project like you describe in your example but with a small solar panel to recharge? I ran in an interesting problem that I could not solve: If the ESP (I use a 8266) drains the battery below a certain voltage it will crash and use a lot of current until the battery is completely empty. Every time the solar panel manages to charge the battery a bit the ESP will boot up - crash again due to low voltage and drain again... Rinse and repeat until the battery is broken. Any idea what to do about this? I wonder if this problem also happens with the trigBoard
You can use Li-Ion (undervoltage) protected batteries. It may not completely solve your problem.
I used an ATTiny85 (using its internal ADC, a MOSFET and some hysteresis logic) to control when enable power to ESP.
You may find IC doing the same job.
Thus series is beyond awesome 🙏
Oooopsy, try 2 times per day for the mail to go into and out of the mailbox.
true, didn't think about that, but I got one of those mail boxes with a front and back door - trigBoard is only on the rx side
Nice. How long would it take a lipo to self discahrge anyway?
I think it's time to measure this :) I have so many batteries lying around, I should conduct a little experiment here. These batteries all have a protection circuit which could be another drain on the cell. I'll dig into it... check this out though: ruclips.net/video/lcqt-t9tDe4/видео.html
The Keysight paper suggests .5 to 1% of capacity per month.Not a lot but ‘every little helps’ ... Their white paper describes a neat method of measurement literature.cdn.keysight.com/litweb/pdf/5992-2770EN.pdf?id=2947889
Could you make comparison between this trigboard and nrf24l0+micro ?
Nice design! Love your projects! Can you share at what fab house you made the PCBs? They look awesome!
With such low power draw, would it make sense to use a small solar panel to keep the battery topped off? Wouldn't even need to worry about replacing the battery after a few years and you could get away with a much smaller battery, or even a supercapacitor.
this is assuming your device can operate at the lowest part of the discharge curve before it totally drops off. if not, you need to calculate the higher voltage where your device stops working. But at least what you have is absolute max possible and a good starting point
In guessing ESP-NOW is similar to WiFi-Direct?
i'd use a power tool battery and an battery adapter from terrafirmatechnology.com so the battery can be easily charged, swapped and more durable.
I designed a 3D printed tool battery adapter not too long ago: www.thingiverse.com/thing:3127879
A tool battery really wouldn't be a good fit for these trigboard things though. Way too big and so much wasted potential for capacity and current output.
I think you CAN'T efffectively use up all the 1000mAh in a 1000mAh battery. You only get to use like 20% of that, because if you try to use every last bit of power, you will damage the battery.
Where did that get from? You are pretty much proven wrong by all batteries in the world. Of course the mAh rating are the mAhs you can get out of the battery (at the current specified for the rating) without damaging the battery.
I would wonder the same thing. Is that rating based on taking into consideration that a lipo can only drain to a certain level? You folks all know how companies love to over promise and market their stuff. Just wondering if you really can get that amount of power? Can this be tested?
@@rgmtb
Of course it can be tested. A battery capacity meter isn't something special. And unless you buy "brands" from China or no-name cells, the real capacity is what it says.