How to program a QTR-8RC Reflectance Sensor Array

[@jubair-]

is there a problem in arduino qtrRC exapmle code?

[@edwinma177]

funny coincidence our school science team needed these sensors for a project and the owners of pololu had their sons on the team which we didn;t know until we ordered.

[@Stram_berry]

Bro I want to meet him I need to use it for a contest 😂

[@brunopernar4813]

How often does it need to calibrate, every time robot turns on/off?

[@robotics1015]

If your talking about turning it off/on by using the switch then you don't but if your turning it off by the battery then unfortunately you do. Unless you have a RAM module on ur board the data will erase everytime it's shut off from power. Sorry for responding late, didn't get the notification 😓.

[@gersonfer]

This library has undergone a radical update

[@AuxiliaryPanther]

Yeah, version 4.0.0. pololu.github.io/qtr-sensors-arduino/md_usage.html

[@felipegutierrez2620]

GENIO

[@kelennaanyanwu5372]

Do you need to do anything else like passing the sensor over white surface while its calibrating. I am building a line follower and the codes I have seen have calibration in them but don't say anything about if you are to do anything.

[@robotics1015]

Kelenna Anyanwu. Yes, you do need to calibrate first. Simply have the sensor look at the white surface until the calibration is over. Don't use a white surface where it's not gonna detect. Ex. If your program is going to run on a white table with black tape, don't use a white piece of paper for it's calibration.have it calibrate on the white surface of the table.It has to calibrate on the white surface of It's environment. I Also recommend having an LED as in indicator for the calibration, saves alot of problems 👍

[@marcelolealrivas6801]

What's the Emitter_Pin for??

[@prasadreddy9754]

ok you used only 4 sensors thats right and how to connect switches? and where? any schematic bro?help me please.

[@robotics1015]

Switches are very much like LED's, have one of either side connected to a resistor to GND. Then have the other side connected to the Arduino or any other micro-controller. Do this for the two switches and the pins are shown in the video and link but you can always change them. I recommend using a 100 to 200 resistor for both switches to insure precision of 'off' and 'on' modes. Unfortunately, i don't have a schematic of my robot at the moment but if you need further help please don't hesitate to ask, i would love to help as much as i can :D

[@xuantai2233]

Can i have code