I wanted to have a reliable way to measure the level/voltage of the battery attached to the feather. The popular guidance was to “keep the adc input voltage to no more than 1 volt,” which would lead you to believe that the reference voltage for this ADC is 1 volt, but I couldn’t get the results to match. I found some discussions that said the reference is 0.96 volts, which given my test, is close.
1083-00So I put an ADS1015 ADC on a proto board and connected it with I2C, and set up a test to read the ADS1015 and the ESP8266 ADC and send the results via wifi to a mysql database running on the raspberry pi.
Check out the test conditions and observations (and full results!) over at Zephyr-Labs blog.
ADS1015 12-Bit ADC – 4 Channel with Programmable Gain Amplifier: For microcontrollers without an analog-to-digital converter or when you want a higher-precision ADC, the ADS1015 provides 12-bit precision at 3300 samples/second over I2C. The chip can be configured as 4 single-ended input channels, or two differential channels. As a nice bonus, it even includes a programmable gain amplifier, up to x16, to help boost up smaller single/differential signals to the full range. Read more.
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