- Sun Feb 07, 2016 10:06 pm
#40656
Hi Folks,
Would like to validate a design approach. Feel free to tell me I'm nuts and don't make any sense
I already have an esp8266 nicely working off a 3.7V 750 mAh LiPo battery. Deep sleep, MQTT and all the goodness. The only catch is it's using esp8266's ADC input for a sensor, and I need more. I'd like to be able to monitor the battery voltage (which wouldn't be a problem otherwise, but my ADC is taken already
)
Anyway, I was thinking about using an AtTiny85 as an analog port expander. I found dedicated ADC boards, but I don't need 5 more analog inputs and have a bunch of AtTiny85 around already (ADC expanders are more expensive, too).
So I did my research and looks like I could leverage SoftwareSerial between esp8266 and attiny85 (maybe i2c with some libs, but probably an overkill for a simple reading).
Hardware-wise, I'd like to have them both powered from the same battery and go into a deep sleep (for long). One wakes another, but those are irrelevant details at this stage.
Just came across this nice lib https://github.com/cano64/ArduinoSystemStatus . So each on their own, seems to be possible, it's really about making them all work in a single system.
I went through everything I could find on this forum for a similar setup, although often more than I needed. Ideas?
Thanks in advance!
Would like to validate a design approach. Feel free to tell me I'm nuts and don't make any sense
I already have an esp8266 nicely working off a 3.7V 750 mAh LiPo battery. Deep sleep, MQTT and all the goodness. The only catch is it's using esp8266's ADC input for a sensor, and I need more. I'd like to be able to monitor the battery voltage (which wouldn't be a problem otherwise, but my ADC is taken already
)Anyway, I was thinking about using an AtTiny85 as an analog port expander. I found dedicated ADC boards, but I don't need 5 more analog inputs and have a bunch of AtTiny85 around already (ADC expanders are more expensive, too).
So I did my research and looks like I could leverage SoftwareSerial between esp8266 and attiny85 (maybe i2c with some libs, but probably an overkill for a simple reading).
Hardware-wise, I'd like to have them both powered from the same battery and go into a deep sleep (for long). One wakes another, but those are irrelevant details at this stage.
Just came across this nice lib https://github.com/cano64/ArduinoSystemStatus . So each on their own, seems to be possible, it's really about making them all work in a single system.
I went through everything I could find on this forum for a similar setup, although often more than I needed. Ideas?
Thanks in advance!
