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Updated PZEM004T, Wemos D1 Mini and a 1602 I2C display (markdown)

Michael Ingraham 2019-02-20 22:43:23 -05:00
parent 52093d01b6
commit 27ccf4d1cf
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PZEM004T,-Wemos-D1-Mini-and-a-1602-I2C-display.md

@ -64,7 +64,7 @@ Mains IN, mains OUT, all sealed:
**Wiring Diagram:**
* Check images below for more information about the 1kOhm resistor needed to shift the voltage to 5V from 3V3 for the PZEM-004T serial connection.
* **ALTERNATIVE**: No modification required on the PZEM-004T. Rather than using the 3.3V output from the Wemos D1 Mini to power the PZEM-004T serial interface, use the same 5V buck converter output (also used to supply power to the display and the Wemos D1 Mini) as VDD on the PZEM-004T serial interface. This eliminates the need for the resistor and the need to modify the PZEM-004T at all.
* **ALTERNATIVE**: No modification required on the PZEM-004T. Rather than using the 3.3V output from the Wemos D1 Mini to power the PZEM-004T serial interface, use the same 5V buck converter output (also used to supply power to the display and the Wemos D1 Mini) as VDD on the PZEM-004T serial interface. This eliminates the need for the resistor and the need to modify the PZEM-004T in any way at all.
<img src="https://user-images.githubusercontent.com/21192010/51847858-d4eeff80-231c-11e9-9c13-41172a6924ee.png" height="400" />