Pico energymeter

jabezmcc·Pico_energymeter·KiCAD/Pico_energymeter.kicad_pcb

About the Pico energymeter PCB

Pico energymeter is an open source RP2040/RP2350 PCB design by jabezmcc, published on GitHub under the GPL-3.0 license. It is a 2-layer board measuring 115 × 108 mm, with 27 components from 16 distinct parts.

Its main chip is the Pico, from the RP2040/RP2350 family. Other key parts include the LM358 and HLK-PM01. By type, the board carries 13 resistors, 5 capacitors, 4 connectors, 3 ICs and 1 diode.

It belongs with the displays & leds designs in this gallery.

From the project

Raspberry Pi Pico based true energy meter for appliances

This project couples a simple circuit with a Raspberry Pi Pico to capture the voltage and current waveforms of the power supplying any appliance, allowing a true, cycle-averaged measure of the power consumption.

The circuit uses a step-down transformer and a voltage divider to measure the voltage, and an Amploc current sensor to measure the current. These signals are amplified and offset to the 0 - 3.3 V input range of the Pico ADCs. Waveform data is captured over 3 cycles of the 60 Hz AC line supply, and the product of these is integrated. Phase differences (as would happen with a motor)…

Pico energymeter, from the project README — From the project README

Main components on the Pico energymeter

Pico LM358 HLK-PM01

Pico energymeter bill of materials (BOM)

27 components, 16 distinct parts — part numbers from the project's BOM.

Qty	Part	Footprint	Refs
1	Pico	RPi_Pico_SMD_TH	U1
1	LM358	DIP-8_W7.62mm_Socket	U2
1	HLK-PM01	DIP4_HLK-PM_HLK	U3
1	CONN_01X02_PIN Conn_01x02_Pin	PinHeader_1x02_P2.54mm_Vertical	J1
1	CONN_01X03_SOCKET Conn_01x03_Socket	PinSocket_1x03_P2.54mm_Vertical	J2
1	CONN_01X04_PIN Conn_01x04_Pin	PinHeader_1x04_P2.54mm_Vertical	J3
1	SCREW_TERMINAL_01X02 Screw_Terminal_01x02	TerminalBlock_bornier-2_P5.08mm	J4
1	Varistor_US	RV_Disc_D21.5mm_W4.3mm_P10mm	RV1
1	1N5817	D_DO-41_SOD81_P10.16mm_Horizontal	D2
4	0.1 uF	C_Rect_L10.3mm_W4.5mm_P7.50mm_MKS4	C1, C3, C4, C5
1	220 uF	CP_Radial_D6.3mm_P2.50mm	C2
5	22K 22k	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1, R4, R5, R6, R7
1	1000	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R2
5	10K	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R3, R8, R9, R11, R12
1	20K	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R10
1	2K	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R13

Pico energymeter design files

The KiCad project lives in the jabezmcc/Pico_energymeter repository on GitHub; these links point at the commit this page was built from.

LayoutKiCAD/Pico_energymeter.kicad_pcb
SchematicKiCAD/Pico_energymeter.kicad_sch
BOMKiCAD/BOM.csv

Pico energymeter: common questions

What microcontroller does the Pico energymeter use?

The Pico energymeter is built around the Pico, from the RP2040/RP2350 family.

How big is the Pico energymeter PCB?

The Pico energymeter measures 115 × 108 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Pico energymeter?

27 components, from 16 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Pico energymeter design files?

From the jabezmcc/Pico_energymeter repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Pico energymeter design in my own project?

Yes, under the terms of its GPL-3.0 license, which jabezmcc chose for the repository.

Can I test firmware for the Pico energymeter without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RP2040/RP2350 firmware against it before you order a PCB.