On the original Ringo1 robot (the one with the ribbon cable to the programmer) you need to set Source_Select to HIGH, otherwise it is going to read the voltage of the motor capacitors (which after we actually made the robots we realized we didn't need because it is generally stable). This Source_Select is the same line that selects between the ambient light sensors and the bottom light sensors - so just set the robot to read the ambient sensors, then you can read the ADC on this channel (ADC0) to read the battery voltage.
On the Ringo2 robot, we got rid of the source select for the battery/motor. It now always reads the battery, so there's no need to care what the Source_Select is set to, since we don't need the Motor_Cap reading for anything.
Let me know if that helps.
Thanks,
-Kevin
Statistics: Posted by Kevin — Tue Oct 02, 2018 9:19 pm
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Thanks
Statistics: Posted by KSenijawib — Mon Sep 24, 2018 3:38 pm
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Thank you very much for your answer and info; i've add a 47KOhm on R55 and it works. But first code shared here was wrong...
I had a big mistake attempting to set MotorCapBattVolts to 1 (line 2 of code); MotorCapsBattVolts defines the pin number of ADC!! (0 for Arduino A0)
Source_Select is line to control U8 digital switch; yes...looking schematics Is easy to understand...
Now, I can measure Batt voltage; simple battery indicator is easy to implement. When I have some more time to test battery levels, I will share code
Please Kevin, let me tell you something: scanning the electronic scheme I was pleasantly surprised how tremendously well thought are electronic design.
During KS campaign I did not think it was so well made.
Congratulations
Best regards...
Statistics: Posted by AngoLito — Mon May 30, 2016 8:39 pm
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Because the Vcc to the processor is 3.5v, this battery voltage is measured in reference to the 3.5. If it's above, it's going to read high numbers. The R55 pad was added to bring this down as you suggest, but I see in all the schematics that it is listed as non-populated. If a resistor is added for R55 to create a divider off the 27k R50, it would be readable. Any divider that would bring 4.2 volts down to below 3.5 volts and you would be able to have a useful reading.
I'm glad you pointed this out. Don't know how we missed this all this time.
Thanks,
-Kevin
Statistics: Posted by Kevin — Sat May 28, 2016 3:27 pm
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