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sleep

Put the Adafruit Feather Huzzah to a deep sleep.

Sketch

The sketch can be found here.

Hypothesis

The Adafruit Feather Huzzah can be put to a deep sleep and wake up after a specified amount of time.

Assumptions

WIP

Procedure

Circuit

Connect the RST pin to pin 16.

Circuit made with Circuit Diagram

Code

From the ./test/sleep directory: 

# compile
arduino-cli compile -b esp8266:esp8266:huzzah .
# upload
arduino-cli upload -p /dev/ttyUSB0 -b esp8266:esp8266:huzzah .
# monitor
screen /dev/ttyUSB0 115200

During the first bootup after the upload, the Feather might be stuck with the internal light dim. Press the physical RESET button.

Output

rll��|�l�|�l�b|����r�b�b��nn�lnn���bp��lrlrlp�n��l��bn�|���b��nn�l��l`�nn�lnr���nrr�`p�n�r������bn�|�b��nn��l`�nn�lnr���nrl`r��nrl`��pl`�n�lwaking up
going to sleep
rll��|�l�|�l�b|����r�b�b��nn�lnn���bp��lrlrlp�n��l��bn�|���b��nn�l��l`�nn�lnr���nrr�`p�n�r������bn�|�b��nn��l`�nn�lnr���nrl`r��nrl`��pl`�n�lwaking up
going to sleep
I don't know why there is garbage that is sent to to the serial monitor during bootup of the Feather. The higher the baud rate, the longer the garbage.

Analysis

During normal operation, the Feather should turn on the internal LED for the time specified by DELAY_LOOP.

The Feather should then sleep for the amount of time specified by SLEEP_TIME and the internal LED should turn off.

Conclusion

WIP

Troubleshooting

The internal LED is dim and the console is blank when connected to a computer via USB

The Feather needs to be reset. Press the physical RESET button.

References

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