Replace LEDs and phototransistor on LSA with IR sensors.

[gautam-dev-maker]

The current design of LSA is very prone to ambient light and often cause inconvenience in line following.
Possible solution is to test TCRT-5000 for ambience interference.

If it proves to be better than current design, we can easily modify our LSA design to include it.

[dhairyashah1]

As discussed previously

• Try different IR based Transmitter Receiver Pairs ( PTH and SMD ) from various LAMI vendors on a perfboard
• Test on the current SRA Board and check readings on ADC lines for line-following with and without a buffer amplifier IC
• If buffer amplifier is needed, find a dealer (online or offline) if HEX IC is available ( 5 -6 gates in one IC ) for the facility of more than 4 sensor pairs if desired
• Redesign LSA PCB prototype for the best available combinations
• Test PCB Prototype
• Final Order

Hard deadline - 5th November

@marck3131 proceed with this issue and update ASAP

[ChinmayLonkar]

@marck3131 Please post the perfboard testing results here ASAP

[dhairyashah1]

ping @marck3131. Please post the results here as well.

[marck3131]

5 IR sensors were tested on perfboard with resistors 4.7k E and 100 E , with gpio pin numbers 32, 34, 35, 36, 39
Tested Line following too with the same ...

[dhairyashah1]

@marck3131 Please put the images, sensor placement and line-following demo video with new config here as well for reference.

[marck3131]

https://drive.google.com/drive/folders/12nbabuiU1Kr9oi_pp4pkYO_4yM3ZiEHa?usp=sharing

[ChinmayLonkar]

@dhairyashah1 we can close this issue as this has been implemented in the design.

[dhairyashah1]

@dhairyashah1 we can close this issue as this has been implemented in the design.

LGTM. Design PR #21 merged in master.