diff --git a/PZEM004T-Energy-Monitor.md b/PZEM004T-Energy-Monitor.md index 8c37649b..1d9a153b 100644 --- a/PZEM004T-Energy-Monitor.md +++ b/PZEM004T-Energy-Monitor.md @@ -40,4 +40,68 @@ Configure the GPIO's for hardware serial connection as shown below. +# Connected Power Meter using PZEM-004T, Wemos D1 Mini and a 1602 I2C display +## Parts needed +- Wemos D1 Mini +- PZEM-004T +- Resistor 1k +- [Enclosure](https://www.itead.cc/smart-home/sonoff-ip66.html) +- Power cable +- Little PSU (search for "700ma 3.5w 5v" on usual stores...) +- I2C 1602 LCD Display (I had issues with green one, i2c address 0x3F, while no problems with blue ones, address 0x27) +- Mammuth Clamps + +## Preparation +Install Tasmota on the Wemos D1 Mini and confirm it is functional before connecting the PZEM-004T to its serial interface. You need to compile your own firmware, as none of the actual pre-made binaries have support for both display and PZEM sensor module. + +To compile (I used Core 2.3.0), edit these files: +- sonoff_post.h: look for line (about 230 or so) starting with "**#ifdef USE_DISPLAYS**" and comment out the "**#undef USE_ENERGY_SENSOR**" that follows near there, so it should be like: +``` +//#undef USE_ENERGY_SENSOR +``` +- user_config_override.h: before last **#endif**, add this line +``` +#define USE_DISPLAYS +``` +- my_user_config.h: uncomment line with "**//#define USE_CONFIG_OVERRIDE**" so it's like: +``` +#define USE_CONFIG_OVERRIDE +``` + +## Tasmota config parameter + +Set module as GENERIC (18), then GPIOs as in image: + + + +- use the "**I2CScan**" command to detect your device address, then set it with: "**DeviceAddress XXX**" (where XXX is the decimal converted address found) +- set "**TelePeriod 10**" to have the display refresh every 10 seconds (you can't go under this value...) +- set "**DisplayModel 1**", and "**DisplayMode 0**" +- finally, add a Rule to display values (I choose these ones): +``` +rule1 on tele-ENERGY#Power do DisplayText [z] [x1y0]%value%W endon on tele-ENERGY#Today do DisplayText [x8y0]%value%Wh endon on tele-ENERGY#Voltage do DisplayText [x1y1]%value%V endon on tele-ENERGY#Current do DisplayText [x8y1]%value%A endon +``` +- remember to enable the rule, with "**rule1 1**" + +## Images and Wiring diagram + +**DANGER - MAINS VOLTAGE**. Be sure to crimp connectors and use heat-shrinking tube wherever possible/needed, and tightly secure any screw. + + + +How it looks, from web gui: + + + +How it looks, from closed box (set contrast using the little trimmer/pot on back of display, and i cut a bit of corners from display to have it flush with border, and used 2 exagonal plastic standoffs with nuts and bolts to secure it to trasparent top): + + + +Mains IN, mains OUT, all sealed: + + + +Wiring Diagram, check other images in this page for more info about the 1K resistor needed to reduce voltage from 5V to 3V3 for the serial connection. + +