and i fear that you can't get a "full" reading of the sensor (so current+voltage+active power at the same time), since you have to do 3 different requests to the sensor. PZEM-004T Energy Monitor: The PZEM-004T is an integrated module designed for measuring electrical parameters in an AC circuit. It can measure voltage, current, power, energy, and other electrical parameters accurately. The sensor uses non-invasive current transformers (CTs) or current coils to measure the current flowing through a wire without the need for cutting or interrupting the circuit. Die Dioden habe ich im Tx Strang verbaut. Nur die zusätzliche Versorgung hab ich nicht drin. Es funktioniert auch ohne. Ist die einfach nur zur Unterstützung des Bus da? Why bother with a burden? The c.t. will be very happy driving into an almost dead short - it’s delivering almost zero power. It could be a 100-turns coil - or as many turns as will fit and give a nice round number to multiply the reading by - say 50 turns ideally. 500 A primary current in the ‘big’ c.t will give 1 A secondary current, and 50 At from the primary winding of the ‘small’ c.t, and the instrument reads 50 A instead of 500.

Peaceview PZEM-004T Energy Module - Raspberry Pi Forums Peaceview PZEM-004T Energy Module - Raspberry Pi Forums

This module is equipped with TTL serial data communication interface, you can read and set the relevant parameters via the serial port; but if you want to communicate with a device which has USB or RS232 (such as computer), you need to be equipped with different TTL pin board (USB communication needs to be equipped with TTL to USB pin board; RS232 communication needs to be equipped with TTL to RS232 pin board), the specific connection type as shown in Figure 2. In the below table are the communication protocols of this module: No Bharat Pi is an IoT prototyping board for students, innovators, startups, and developers. A simplified board with an all-in-one compute, network and storage on a single board to build rapid prototypes. After testing or testing the function and confirmed that the PZEM-004T V3.0 module is functioning properly, it can be continued by making a program with Arduino or other microntroller. Code ProgramVV][scheduler:131]: Running interval 'update' with interval=60000 last_execution=153078 (now=213080) This tiny PZEM-004T circuit is great for measuring AC (RMS) voltage, current, and power (single-phase). The unit easily interfaces with Arduino and other hardware using the code library.

PZEM-004T Energy Monitor — ESPHome Peacefair PZEM-004T Energy Monitor — ESPHome

I re-read this entire thread and noted several comments about swapping RX/TX so I did it physically.PS: remember that even if you give power on the "serial side" of the device, it will work only if it's connected to mains.. Ich hab inzwischen nur noch einen angeschlossen und die Diode + Widerstand entfernt. Leider auch ohne Erfolg. Einzigster Unterschied ist, wenn ich Rx und Tx beim Wemo ändere, dann geht die andere Diode im Modul an. Aber trotzdem keine Kommunikation. Image re-used from https://www.instructables.com/id/Use-Homie-Firmware-to-Drive-Sonoff-Switch-Module-E/ Thanks @amayii0) marcuskl ist bei dir die Anzeige genau? Oder hast du manchmal auch Abweichungen, die man nicht zuordnen kann? The TX pin of the PZEM-004T should be connected to the RX pin of the Bharath Pi board, and the RX pin of the PZEM-004T should be connected to the TX pin of the Bharath Pi board. This is because the PZEM-004T uses serial communication, and the communication direction is from the PZEM sensor to the Bharath Pi board.