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Updated PZEM004T Energy Monitor (markdown)

Theo Arends 2018-08-29 11:15:36 +02:00
parent a47e19f4f5
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12
PZEM004T-Energy-Monitor.md

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<img src="https://github.com/arendst/arendst.github.io/blob/master/media/pzem/pzem-done.jpg" width="250" align="right" />
When a clamp on energy monitor is needed the PZEM-004T together with a Sonoff Basic can be used.
The PZEM-004T together with a Sonoff Basic provide a good clamp on energy monitor.
## Parts needed
- Sonoff Basic
- PZEM-004T
- Resistor 1k
- Enclosure
- [Enclosure](https://www.itead.cc/smart-home/sonoff-ip66.html)
- Power cable
## Preparation
Install Tasmota on the Sonoff Basic and confirm it's functionality before connecting the PZEM-004T to it's serial interface.
## Hardware connections
As the PZEM-004T expects 5V serial data and the Sonoff Basic only provides up to 3V3 the expected optocoupler input power of the PZEM-004T has to reduced. This can be accomplished by soldering a 1k resistor between the joints as shown below.
As the PZEM-004T expects 5V serial data and the Sonoff Basic only provides up to 3V3 the expected optocoupler input power of the PZEM-004T has to be reduced. This can be accomplished by soldering a 1k resistor between the joints shown below.
<img src="https://github.com/arendst/arendst.github.io/blob/master/media/pzem/pzem-fix.jpg" height="400" />
Now connect the serial interface of the Sonoff Basic with the serial interface of the PZEM-004T. See picture regarding used colors and connections.
Connect the serial interface of the Sonoff Basic with the serial interface of the PZEM-004T. See pictures regarding used colors and connections.
- 3V3 Red
- Rx Yellow
@ -25,7 +25,9 @@ Now connect the serial interface of the Sonoff Basic with the serial interface o
<img src="https://github.com/arendst/arendst.github.io/blob/master/media/pzem/pzem-basic.png" height="400" />
Cut the power cable in two and connect the input to both Sonoff Basic and PZEM-004T. Route one of the power output lines through the PZEM-004T core and connect it to the Sonoff Basic output.
Cut the power cable in two and connect the input wires to both Sonoff Basic and PZEM-004T. Route one of the power output wires through the PZEM-004T core and connect the output wires to the Sonoff Basic output.
As most parts are connected to AC try to fit the hardware in a solid enclosure.
## Software configuration
Configure the GPIO's for hardware serial connection as shown below.