ADC multiplex for Wemos D1 Mini
Vin = 0.1 to 7 voltage (2x)
Vadc = 0.01 to 0.70 voltage
material per ADC-multiplex:
1x BS170 N-Mosfet / 0,10€
1x Resistor 680k
1x Resistor 1k (optional)
A0-pin voltage divider 220k / 100k
GPIO = LOW (GND) messure internal voltage
GPIO = HIGH (3V) messure external voltage
Designed to messure battery + solar voltage.
internal: 2.7 Vadc × 1.22 = 3.3V real
external: 0.37 Vadc × 10 = 3.7V real
external: 0.42 Vadc × 10 = 4.2V real
There is only one ADC-pin at ESP8266. With mosfet's you can extend multiple ADC's.
GND *---* (-Battery)
BS170.1-(D) *---[680kOhm]---* (+Battery)
BS170.1-(G) *---[1kOhm]---* (D5.ESP)
BS170.1-(S) *---* (A0.ESP)
GND *---* (-Solar)
BS170.2-(D) *---[680kOhm]---* (+Solar)
BS170.2-(G) *---[1kOhm]---* (D6.ESP)
BS170.2-(S) *---* (A0.ESP)
