Component: Energy Monitor (PZEM-004T) (Electrical)

Author	Matrix Ltd.
Version	1.0
Category	Electrical

Energy Monitor (PZEM-004T) component

The PZEM-004T module is used for measuring AC voltage, current, active power, frequency, power factor & overcurrent. Resetable active energ and the overpower level can be set and monitored.

Component Source Code

Please click here to download the component source project: FC_Comp_Source_Energy_Monitor_PZEM-004T.fcfx

Please click here to view the component source code (Beta): FC_Comp_Source_Energy_Monitor_PZEM-004T.fcfx

Detailed description

No detailed description exists yet for this component

Examples

Notes: if there is a communication issue after initialisation, then just 9's will be returned!

For the display properties, make sure Use SPI is set to No

The TX of the PZEM-004T energy monitor goes to RX of the microcontroller

The RX of the PZEM-004T energy monitor goes to TX of the microcontroller. If using an Uno, the PZEM-004T must be disconnected from the RX prior to programming. After reconnecting press the Reset button on the Uno.

If using a morocontroller that have 3V tolerant pins only, e.g ESP32, then connect the supply going to the PZEM-004T to 3v and not 5V.

WARNING: MAINS CAN KILL. ONLY TRY THIS IF YOU ARE EXPERIENCED WITH MAINS ELECTRICITY. WIRE AT YOUR OWN RISK!

This example program uses a PZEM-004T energy monitor to monitor mains voltage, current, frequency, power factor, energy, and over-threshold power alarm.

The alarm threshold is set within properties.

Initialiasion returns 0 if PZEM-004T is detected or 255 if it is not. Values are sent to the ESP32 TTGO display which uses a ST7789v1 GLCD.

ESP32 TTGO Mains PM v1.3

This example uses the Arduino Uno and outputs UART via the Timer UART component on pin D2 at a baud rate of 19200.

All the functions are the same as above but no display is used.

D3 and D4 have pullups so no external resistors are required.

Each switch is pulled to GND to trigger.

You will require A TTL UART to USB converter to view the data as the one built-in to the Uno is used for the MODBUS of the power monitor

Arduino Uno Mains PM v1.0

Macro reference

Initialise

	Initialise
Starts up the UART to allow communications. Also, checks if PZEM-004T is detected. Returns 0 if detected or 255 if not detected.
- BYTE	Return

ReadAlarmStatus

	ReadAlarmStatus
65535 = Overpower alarm triggered. 0 = Overpower alarm not triggered.
- UINT	Return

ReadCurrent

	ReadCurrent
Read what the current draw is. Resolution: 0.001A Measurement accuracy: 0.5%
- FLOAT	Return

ReadEnergy

	ReadEnergy
Read active energy value. Resolution: 1Wh Measurement accuracy: 0.5%
- FLOAT	Return

ReadFrequency

	ReadFrequency
Reads the frequency of the mains
- FLOAT	Return

ReadPower

	ReadPower
Read active power. Starting measure power: 0.4W Resolution: 0.1W
- FLOAT	Return

ReadPowerAlarmThreshold

	ReadPowerAlarmThreshold
Reads the power alarm threshold in watts
- UINT	Return

ReadPowerFactor

	ReadPowerFactor
Read power factor Resolution: 0.01 Measurement accuracy: 1%
- FLOAT	Return

ReadVoltage

	ReadVoltage
Read voltage. Measuring range:80～260V Resolution: 0.1V Measurement accuracy: 0.5%
- FLOAT	Return

ResetEnergy

	ResetEnergy
Reset the energy value
- BYTE	Return

SetPowerThresholdLevel

	SetPowerThresholdLevel
Sets the power alarm threshold in watts
- UINT	PowerThresholdValue
Reg addreess high of alarm threshold
- BYTE	Return

Property reference

	Properties
	UART Properties
	Channel
UART Channel selector Software channels are bit banged using generic I/O pins but are not as reliable as hardware channels. Hardware channels use the selected peripheral on-board the target microcontroller.
	TX
Pin to be used for Transmit data
	RX
Pin to be used for Receive data
	Baud Options
Baud rate option selector
	Baud Rate
	Bus
Specifies the bus mode being used, RS232 allows you to connect a single master node to a single slave node. RS485 allows you to connect a single master node to multiple slave nodes.
	Modbus Properties
	Receive Buffer Size
Maximum number of bytes the receive buffer can hold
	Slave ID Bytes
Number of bytes used when passing a slave ID, usually 1 but sometimes 2
	Silent Interval
Configures how much time to wait after each master modbus command before another command can be sent. A silent interval of 60ms minimum is required in order to guarentee successful reception of the next transmission. 0=No Delay 60 = 60mS - Default Range : 0 - 65535
	UART Receive Timeout
Amount of time to wait before timing out when listening for a slave's response. Range: 0 - 255. 0 = Don't Wait 1 - 254 = X ms 255 = Wait Forever
	Receive Timeout Count
Number of timeouts in a row to wait for until we decide the slave is not responding or finished responding to a message. Range: 0 - 255 0 = First Timeout Only 1 = First Timeout + 1 2 = First Timeout + 2
	Simulation Properties
	Label
A text label to appear on the Modbus panel object.
	Scope Traces
Selects if the scope traces are automatically added to the data recorder window or not. Simulation - draws an approximation of the UART data onto the scope trace. ICT - sets up the scope trace for incoming data and adds UART packet decoding at the correct BAUD.
	Console Data
Selects if the console data is automatically generated or not
	Console Columns
Number of characters that can be displayed on a single line of the console.
	Data Source
Simulation data source used to allow the component to connect to various remote devices Nothing - Simulation data is ignored COM port - Routes the communication data to and from a physical or virtual COM port API - Routes the communication data via a data API component on the Panel.