Continuity
About the Continuity PCB
Continuity is an open source RISC-V PCB design by tvecera, published on GitHub under the MIT license. It is a 2-layer board measuring 50.5 × 18 mm, with 14 components from 13 distinct parts.
Its main chip is the CH32V003J4M6, from the RISC-V family. Other key parts include the ESDLC054D. By type, the board carries 6 resistors, 2 ICs, 2 capacitors, 1 transistor, 1 battery holder and 1 switch.
From the project
Simple continuity tester built on the RISC-V microcontroller CH32V003J4M6 in SOP8 package. Uses the built-in OPA (op-amp as comparator) for low-resistance detection between probes, BSS138 N-MOSFET to disconnect the measurement branch in sleep mode, and a passive piezo buzzer with
Simple continuity tester built on the RISC-V microcontroller CH32V003J4M6 in SOP8 package. Uses the built-in OPA (op-amp as comparator) for low-resistance detection between probes, BSS138 N-MOSFET to disconnect the measurement branch in sleep mode, and a passive piezo buzzer with push-pull drive for loud signaling.
Adapted from the original Continuity Tester project by David Johnson-Davies (Technoblogy), ported from ATtiny to CH32V003.
Main components on the Continuity
Continuity bill of materials (BOM)
14 components, 13 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CH32V003J4M6 | SOP8 | IC1 |
| 1 | ESDLC054D | SOT-363_SC-70-6 | U1 |
| 1 | BSS138 | SOT-23 | Q1 |
| 1 | Battery_Cell | BatteryHolder_Keystone_1060_1x2032 | BT1 |
| 1 | PROG | SW_SPST_TL3342 | SW1 |
| 1 | LED | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1 |
| 1 | 100nF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1 |
| 1 | 10uF | C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2 |
| 2 | 33K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1, R2 |
| 1 | 51R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 22R | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R4 |
| 1 | 10K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R5 |
| 1 | 1K | R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R6 |
Continuity design files
The KiCad project lives in the tvecera/ch32-projects repository on GitHub; these links point at the commit this page was built from.
Continuity: common questions
What microcontroller does the Continuity use?
The Continuity is built around the CH32V003J4M6, from the RISC-V family.
How big is the Continuity PCB?
The Continuity measures 50.5 × 18 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Continuity?
14 components, from 13 distinct parts. The full bill of materials is listed on this page.
Where can I download the Continuity design files?
From the tvecera/ch32-projects repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Continuity design in my own project?
Yes, under the terms of its MIT license, which tvecera chose for the repository.
Can I test firmware for the Continuity without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug RISC-V firmware against it before you order a PCB.
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