ESP8266 Community Forum

- Wed Aug 10, 2016 9:25 pm #52680 Anyone have any code to talk to an i2c ADS1115 ADC board?

Gary

- Thu Aug 11, 2016 1:01 pm #52713

What is your Measured Full scale voltage for your ADC input?

Are you referring to the actual voltage on the ADC rather than the calculated voltage based in Vin * (R2/(R1+R2))? I have not measured it but I guess it probably is not exactly 1v. I will increase the resistor sizes and check the actual voltage on the ADC pin. I also read carefully the site you linked to. A quick passed showed there was a lot they were considering that I was not.

Thank you for your help.

Hi Mike,

Added a new example for Voltage divider and ESP8266 Internal ADC input voltage calculation for a 0-5V Voltage input range.

ESP8266 MPDMv4 AC MAINS Dimmer Home: http://esp8266-projects.com/2016/04/mpdmv4-mains-dimmerswitch-html/
Available on Tindie: https://www.tindie.com/products/nEXT_EVO1/universal-ac-mains-dimmer-mpdmv41/

- Thu Mar 16, 2017 4:53 am #63773

Hi All,

I am trying to read the voltage from a 6v Home solar system installation using an ESP-12. I have a voltage divider made up of a 10k and 2k resistor. When I did my testing my voltmeter was reading 5v from the solar panel and analogread(A0) is giving me 803, from that I calculate 803/1024 * 6 to me 4.705v. This is a 6 to 7% difference, which I find pretty big. What could be causing such a large variation?

Mike

I like it when individuals come together and share thoughts.Thanks for sharing!!

- Tue Aug 08, 2017 6:33 am #68915 What will be the minimum voltage level for roof top solar panel??