HydraMeter 0.4

jduffy105·HydraMeter_0.4·MMTR_AFE_00_04_TORELEASE/MMTR_AFE_00_04_TORELEASE.kicad_pcb

About the HydraMeter 0.4 PCB

HydraMeter 0.4 is an open source RP2040/RP2350 PCB design by jduffy105, published on GitHub under the CERN-OHL-S-2.0 license. It is a 2-layer board measuring 76.2 × 114.3 mm, with 288 components from 98 distinct parts.

Its main chip is the Pi Pico, from the RP2040/RP2350 family. Other key parts include the 5V, 3.3V, 74HC595BQ,115, TC7MBL3126CFT and PI5A3157CEX. By type, the board carries 83 connectors, 80 resistors, 53 capacitors, 24 ICs, 19 transistors and 13 diodes.

It belongs with the test & measurement and power & battery designs in this gallery.

From the project

Open source multimeter

I don't have detailed assembly documents yet, and this isn't really well made for easy assembly in any case, it's a proof of concept at the moment.

There are some more details here: https://hackaday.io/project/176607-hydrameter but it's not much. Mainly a few entries down there's a tour of how the analog stuff works: https://hackaday.io/project/176607-hydrameter/log/223270-schematic-and-operation

Main components on the HydraMeter 0.4

5V 3.3V 74HC595BQ,115 TC7MBL3126CFT PI5A3157CEX SP491EEN STISO621TR 8kbit DSLVDS1001DBVR SN74HCS165PWR 74LVC1G126W5-7 Pi Pico

HydraMeter 0.4 bill of materials (BOM)

288 components, 98 distinct parts.

Qty	Part	Footprint	Refs
1	~ onsemi	NL7WB66	U1
1	~ Microchip	SOIC-16	U2
1	~ Microchip	20_Pin_Breakout_0p6_Wd	U3
1	~ Microchip	SOT23-5_LMC7101BYM5-TR	U4
1	~ Morsun	B0309S-1WR3	U6
1	~ Recom	RFM-0505S	U7
1	~ Lite-On	LTV-816	U8
1	5V Diodes Incorporated	SOT23-5	U9
1	~ Rohm	SC-74A_LMR312	U10
1	3.3V Diodes Incorporated	SOT23-3	U11
3	74HC595BQ,115 Nexperia	16-DHVQFN_74HC595BQ	U12, U13, U16
1	TC7MBL3126CFT Toshiba	TSSOP-14_TC7MBL3126CFT	U14
1	~	Mmtr_Input_Module	U15
1	PI5A3157CEX Diodes Incorporated	SC-70_PI5A3157CEX	U17
1	SP491EEN MaxLinear	SOIC-14_3.9x8.7mm_P1.27mm	U18
1	STISO621TR STMicroelectronics	SOIC-8_STISO621TR	U19
1	8kbit Microchip	SOT23-3	U20
1	DSLVDS1001DBVR Texas Instruments	SC-74A_DSLVDS1001DBVR	U24
1	3.3V Microchip	SOT23-5	U25
2	SN74HCS165PWR Texas Instruments	TSSOP-16	U27, U28

Show 78 more

Qty	Part	Footprint	Refs
1	74LVC1G126W5-7 Diodes Inc	SC-74A	U29
1	Pi Pico Raspberry Pi	Pi_Pico_WUSB	A1
1	RFM69HCW	RFM69HCW	M1
1	~ Nordic	NRF24L01	M2
11	~ Diotec	DMN65D8L-7	Q1, Q2, Q3, Q4, Q5, Q6, Q12, Q15 +3
8	~ Micro Commercial	SOT23-3	Q7, Q8, Q9, Q10, Q11, Q13, Q14, Q18
4	~ Cal Test Electronics	CT2914	J1, J2, J3, J4
32	~	Header_Pin_01x01	J5, J6, J7, J8, J10, J11, J24, J30 +24
29	~	Test_Pad_30x30mil	J12, J13, J15, J16, J17, J18, J19, J20 +21
1	IN_3	Header_Pin_01x01	J31
2	~	MiniPin_25mil	J44, J46
1	IN_2	Header_Pin_01x01	J56
1	IN_1	Header_Pin_01x01	J57
1	IN_0	Header_Pin_01x01	J60
1	IN_8	Header_Pin_01x01	J83
1	IN_9	Header_Pin_01x01	J84
1	IN_A	Header_Pin_01x01	J85
1	IN_B	Header_Pin_01x01	J86
1	IN_C	Header_Pin_01x01	J87
1	IN_D	Header_Pin_01x01	J88
1	IN_E	Header_Pin_01x01	J89
1	IN_F	Header_Pin_01x01	J90
1	IN_4	Header_Pin_01x01	J92
1	IN_5	Header_Pin_01x01	J93
1	IN_6	Header_Pin_01x01	J94
1	IN_7	Header_Pin_01x01	J95
2	~	Header_Pin_01x01	DM1, DP1
1	16A Bel Fuse	FC-102_BRIGHT_TIN	F1
1	500mA Bel Fuse	FC-102_BRIGHT_TIN	F2
1	63mA SCHURTER	0034.6062	F3
1	230 VRMS TDK	B72205S0231K311	RT1
1	75 VRMS Bourns	2045-07-BLF	RT2
1	3.3V	MOV_0603	RT3
3	3V3	MOV_0603	RT4, RT5, RT6
1	18V	MOV_0805	RT7
11	1N4007FL SMC	1N4007FL	D1, D2, D6, D7, D8, D9, D10, D11 +3
2	~ Toshiba	CUS08F30,H3F	D3, D4
1	500mOhm TAI_TECH	WCM 2012F2SF-361T03	L1
1	10p	Cap_SMD_0603	C1
1	100p	Cap_SMD_0603	C2
22	100n	Cap_SMD_0603	C3, C5, C6, C13, C16, C18, C20, C22 +14
5	1u	Cap_SMD_0603	C4, C21, C56, C68, C70
3	2u2	Cap_SMD_0603	C7, C8, C15
4	47u	Cap_SMD_1206	C9, C11, C14, C57
1	10n	Cap_SMD_0603	C10
3	1u	Cap_SMD_1206	C12, C27, C28
1	2u2	Cap_SMD_1206	C17
4	10u	Cap_SMD_1206	C19, C26, C31, C36
2	1n	Cap_SMD_0603	C24, C25
1	1.5n	Cap_TH_Film_0.4Spc	C54
1	220p	Cap_TH_Film_0.2Spc	C55
1	1.8n	Cap_SMD_0603	C59
1	27n	Cap_SMD_0603	C61
1	100n	Cap_SMD_0805	C66
1	33p	Cap_SMD_0603	C73
2	100K	Resistor_THT_Vert_0p2_1o4W	R1, R2
2	400K	Resistor_THT_Vert_0p2_1o4W	R3, R4
2	50	Resistor_0603	R5, R54
31	10K	Resistor_0603	R6, R7, R8, R9, R10, R24, R34, R39 +23
8	1K	Resistor_0603	R11, R18, R19, R20, R21, R22, R23, R31
1	9M1	Resistor_1206	R12
2	100K	Resistor_1206	R13, R28
1	6K8	Resistor_0805	R14
1	10m	Resistor_2512_4Pin	R15
1	330m	Resistor_1206	R16
1	100	Resistor_1206	R17
1	1K	Resistor_1W_Thru_Wide	R25
1	510	Resistor_1206	R26
1	10K	Resistor_1206	R27
1	1M	Resistor_1206	R29
1	3K3	Resistor_0603	R30
3	33K	Resistor_0603	R32, R33, R58
8	100K	Resistor_0603	R35, R36, R37, R38, R47, R51, R52, R57
6	330K	Resistor_0603	R44, R46, R56, R59, R60, R65
1	1M	Resistor_0603	R45
3	510K	Resistor_0603	R49, R55, R64
1	100	Resistor_0603	R53
1	120	Resistor_0603	R63

HydraMeter 0.4 design files

The KiCad project lives in the jduffy105/HydraMeter_0.4 repository on GitHub; these links point at the commit this page was built from.

HydraMeter 0.4: common questions

What microcontroller does the HydraMeter 0.4 use?

The HydraMeter 0.4 is built around the Pi Pico, from the RP2040/RP2350 family.

How big is the HydraMeter 0.4 PCB?

The HydraMeter 0.4 measures 76.2 × 114.3 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the HydraMeter 0.4?

288 components, from 98 distinct parts. The full bill of materials is listed on this page.

Where can I download the HydraMeter 0.4 design files?

From the jduffy105/HydraMeter_0.4 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the HydraMeter 0.4 design in my own project?

Yes, under the terms of its CERN-OHL-S-2.0 license, which jduffy105 chose for the repository.

Can I test firmware for the HydraMeter 0.4 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.