ESP Pins logic is indeed 3.3V but they are 5V tolerant.
I typically use all sensors/actors that support 5V directly with esp’s since years without any problems. I also use pzem004t’s without any level shifter and they work a treat.
Would there be any issue with extending the wires on the split core ct clamp?
Hello there, do i need to do for each PZEM at start-up and then do the normal configuration?
I don’t think so.
Here is how I made my devices.
So far I made 10 of these. I’m using a generic bar soap case as an enclosure. Soap cases are less than 1 USD.
I’m using a cheap bidirectional 5V-3V digital converter module to power the ESP01 with 5V and also to allow bidirectional communication with 5V serial TTL with PZEM. Also I’m using a simple USB TTL converter for ESP01 for programming. I’ve added a switch to put it into programming mode and a button to reset.
Power supplies are 5V USB chargers. I bought 25 of them from Amazon at 1 USD each when they were on sale. They are about 5 USD each now which is still a bit cheaper than they can go for.
I’m using computer power cables with IEC connectors. I cut the IEC connector and add a female mains connector. I using cable ties to keep the power cables from moving.
The way I wired the PZEM module allows me to measure its own consumption as well as the 5V power supply in addition to the load.
Here is the ESPHome code.
substitutions:
device_description: "Fridge"
esphome:
name: powermeter-10
comment: '${device_description}'
esp8266:
board: esp01_1m
# Enable logging
logger:
baud_rate: 0
# Enable Home Assistant API
api:
ota:
password: "*****"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Powermeter-10 Fallback Hotspot"
password: "*****"
captive_portal:
uart:
tx_pin: GPIO1
rx_pin: GPIO3
baud_rate: 9600
modbus:
sensor:
- platform: pzemac
current:
name: "PM-${device_description} Current"
voltage:
name: "PM-${device_description} Voltage"
power:
name: "PM-${device_description} Power"
energy:
name: "PM-${device_description} Energy"
frequency:
name: "PM-${device_description} Frequency"
power_factor:
name: "PM-${device_description} Power Factor"
update_interval: 2s
Here are the pictures:
5 Likes
Hi, I assembled the circuit as shown in the previous messages and once mounted in the electrical panel it ran smoothly for 2 days. This morning I realized that the data was no longer available and even restarting it did not solve the problem. I disassembled the meter and I did not notice any hardware problems, so I reconnected it but after some time the led of the nodemcu started flashing very quickly and then it went out. It hasn’t given any signs of life since and I can’t even flash the firmware again. What may have happened? My configuration is this:
esphome:
name: "pmeter"
esp8266:
board: nodemcuv2
# Enable logging
logger:
# Enable Home Assistant API
api:
encryption:
key: "*********"
ota:
password: "*****"
wifi:
ssid: !secret wifi_ssid
password: !secret wifi_password
# Enable fallback hotspot (captive portal) in case wifi connection fails
ap:
ssid: "Power-Meter Fallback Hotspot"
password: "*****"
captive_portal:
uart:
- id: ubus1
tx_pin: GPIO1
rx_pin: GPIO3
baud_rate: 9600
stop_bits: 1
time:
platform: sntp
id: my_time
on_time:
- seconds: 57
minutes: 59
hours: 23
then:
- sensor.template.publish:
id: template_pMeter_veille
state: !lambda return id(pMeter_power_of_day).state;
sensor:
#### PZEM-004T V3 ####
- platform: pzemac
address: 1
current:
name: "Power Meter - Corrente"
accuracy_decimals: 2
voltage:
name: "Power Meter - Tensione"
accuracy_decimals: 2
power:
name: "Power Meter - Potenza Attiva"
unit_of_measurement: W
accuracy_decimals: 2
id: pMeter_power
frequency:
name: "Power Meter - Frequenza"
unit_of_measurement: Hz
accuracy_decimals: 2
power_factor:
name: "Power Meter - Fattore di potenza"
accuracy_decimals: 2
id: pMeter_power_factor
energy:
name: "Power Meter - Energia"
unit_of_measurement: Wh
accuracy_decimals: 1
id: pMeter_energy
update_interval: 5s
- platform: template
name: "Power Meter - Potenza cumulativa"
unit_of_measurement: "kWh"
accuracy_decimals: 1
update_interval: 5s
icon: mdi:power
lambda: return (( (id(pMeter_energy).state)/1000.0));
- platform: total_daily_energy
name: "Power Meter - Energia giornaliera"
power_id: pMeter_power
unit_of_measurement: "kWh"
accuracy_decimals: 2
id: pMeter_power_of_day
filters:
# Multiplication factor from W to kW is 0.001
- multiply: 0.001
icon: mdi:counter
- platform: template
name: "pMeter_veille"
id: template_pMeter_veille
unit_of_measurement: "kwh"
accuracy_decimals: 2
icon: mdi:power
update_interval: 10s
- platform: template
name: "Power Meter - Potenza Apparente"
id: pMeter_power_apparente
unit_of_measurement: "VA"
accuracy_decimals: 2
update_interval: 5s
icon: mdi:power
lambda: return ((id(pMeter_power).state/id(pMeter_power_factor).state));
- platform: template
name: "Power Meter - Potenza Reattiva"
id: pMeter_power_reactive
unit_of_measurement: "VAr"
accuracy_decimals: 2
update_interval: 5s
icon: mdi:power
lambda: return (( sqrt( (id(pMeter_power_apparente).state)*(id(pMeter_power_apparente).state) - (id(pMeter_power).state)*(id(pMeter_power).state) ) ));
- platform: wifi_signal
name: "WiFi Power Meter - Potenza segnale wifi"
update_interval: 10s
- platform: uptime
name: "up"
id: uptime_sec
switch:
- platform: restart
name: "Power Meter - Riavvio"
binary_sensor:
- platform: status
name: "Power Meter - Stato"
text_sensor:
- platform: template
name: Power Meter - Uptime
lambda: |-
int seconds = (id(uptime_sec).state);
int days = seconds / (24 * 3600);
seconds = seconds % (24 * 3600);
int hours = seconds / 3600;
seconds = seconds % 3600;
int minutes = seconds / 60;
seconds = seconds % 60;
return { (String(days) +"d " + String(hours) +"h " + String(minutes) +"m "+ String(seconds) +"s").c_str() };
icon: mdi:clock-start
update_interval: 113s
How are you converting 3.3V - 5V serial communication?
I would like to replicate your project, however, I didn’t find the diagram. Is there any? What module has been used? thanks
I have used this module https://www.aliexpress.com/item/4000527585052.html?spm=a2g0o.order_list.order_list_main.10.1a3c18024bW1q8
I think I had used this diode: bat45
2 Likes
‘’’
Hi,
Since the last update I have this problem.
Any idea ?
Thx
[09:56:17][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:18][W][modbus:105]: Modbus CRC Check failed! EECB!=2100
[09:56:18][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:19][W][modbus:105]: Modbus CRC Check failed! 7EC6!=2100
[09:56:19][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:20][W][modbus:105]: Modbus CRC Check failed! 7EC6!=2100
[09:56:20][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:21][W][modbus:105]: Modbus CRC Check failed! 7EC6!=2100
[09:56:21][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:22][W][modbus:105]: Modbus CRC Check failed! EECB!=2100
[09:56:22][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:23][W][modbus:105]: Modbus CRC Check failed! EECB!=2100
[09:56:23][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:24][W][modbus:105]: Modbus CRC Check failed! EE61!=2100
[09:56:24][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:25][W][modbus:105]: Modbus CRC Check failed! EE61!=2100
[09:56:25][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:26][W][modbus:105]: Modbus CRC Check failed! 7E6C!=2100
[09:56:26][W][modbus:105]: Modbus CRC Check failed! F141!=00
[09:56:27][W][modbus:105]: Modbus CRC Check failed! 1E75!=2100
[09:56:27][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:28][W][modbus:105]: Modbus CRC Check failed! 7EC6!=2100
[09:56:28][W][modbus:105]: Modbus CRC Check failed! 3300!=00
[09:56:29][W][modbus:105]: Modbus CRC Check failed! 7EC6!=2100
[09:56:29][W][modbus:105]: Modbus CRC Check failed! 3300!=00
‘’’
I think the difference is that it talks to all of them at the same time.
I have change the “update_interval:” on one to be 1s, the other to be 1.02s
I get periodic CRCs when they align, but overall 95% of reads are good.
I used to have a delay in the code for the second one, but since an update that shows as a yaml error, so I can’t have it in the code now.
Hope this helps.
Steve
And they can be wired in parallel, since on Tx, each is just an LED and resistor on the PZEM board, and on the Rx, any one of them that is replying (- assuming you only addressed one!) can pull the input to the ESP down to ground.
If you want to talk to many, you’d need to change the drive strength of the ESP (ESP32 only feature), or the current it can output will be too low, when divided between all the PZEM bards, to drive the optocouplers and be able to signal to the PZEM electronics.
Otherwise 1 transistor could buffer the current if needed.
Drop me an Email if you want a diagram etc. [email protected] remove the 1’s
I have the same issue with the
Modbus CRC Check failed!
Have you found a solution?
Steeve wrote about reporting issue of several devices. But I have one only to test it.
Appears there was a bug introduced around 2022.11.3 that causes issues with modbus.
Some are having success with changing the arduino framework version as below.
esp32:
board: nodemcu-32s
framework:
type: arduino
version: 2.0.6
Here are a couple related GitHub issues
In my case, I had an issue at about the same version that caused the Quinled-ESP32 ABE boards to not boot and switching to esp-idf resolved it.
I try to change address my PZEM004T to 0x003 to this code:
but it always has the old address: 0x01 what am I doing wrong?
esphome:
name: ac-mero-01
on_boot:
## configure controller settings at setup
## make sure priority is lower than setup_priority of modbus_controller
priority: -100
then:
- lambda: |-
auto new_address = 0x03;
if(new_address < 0x01 || new_address > 0xF7) // sanity check
{
ESP_LOGE("ModbusLambda", "Address needs to be between 0x01 and 0xF7");
return;
}
esphome::modbus_controller::ModbusController *controller = id(pzem);
auto set_addr_cmd = esphome::modbus_controller::ModbusCommandItem::create_write_single_command(
controller, 0x0003, new_address);
delay(200) ;
controller->queue_command(set_addr_cmd);
ESP_LOGI("ModbusLambda", "PZEM Addr set");
modbus:
send_wait_time: 200ms
id: mod_bus_pzem
modbus_controller:
- id: pzem
# The current device address.
address: 0x01
# The special address 0xF8 is a broadcast address accepted by any pzem device,
# so if you use this address, make sure there is only one pzem device connected
# to the uart bus.
# address: 0xF8
modbus_id: mod_bus_pzem
command_throttle: 0ms
setup_priority: -10
update_interval: 30s
Not providing any logs?
I think you wrongly changed this part
auto set_addr_cmd = esphome::modbus_controller::ModbusCommandItem::create_write_single_command(
controller, 0x0003, new_address)
the 0x0003 should be left as 0x0002, it’s register number for the address, not the address itself.
