2 layers34 × 68 mm
Dmm sao
flummer/dmm-sao
A small digital multimeter specifically for measuring SAO related stuff
64 parts28CC-BY-SA-4.0
2 layers178 × 80 mm
Panel 1x5
flummer/dmm-sao28A small digital multimeter specifically for measuring SAO related stuff
- Size
- 178 × 80 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 326
- Nets
- 70
- Pads
- 1,356
- Tracks, vias
- 2,470, 695
- Pours
- 10
- Routed
- Yes
- KiCad
- KiCad 8.99 (file 20241030)
- Created
- 22 Oct 2024
- Updated
- 15 May 2025
Overview
Panel 1x5 is an open-source printed circuit board by flummer, from the flummer/dmm-sao repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 178 × 80 mm with 326 parts on 70 nets, routed with 2,470 tracks and 695 vias.
It is built around the RP2040, HX9193-33GB and TS5220A, with the CJ2302, CJ2305 and OWPB-909018S-40-03 among its other parts. Its parts include 120 capacitors, 95 resistors, 20 ICs, 20 switches and 15 connectors. It belongs with the sensors and measurement boards and the RP2040 boards of this library.
Main components
6
RP2040
LQFN-56(7x7)12bit 133MHz 30 LQFN-56(7x7) Microcontrollers (MCU/MPU/SOC) ROHSRaspberry PiMicrocontrollers (MCU/MPU/SOC)
HX9193-33GB
SOT-23-5-40℃~+125℃@(Tj) 1 100uVrms 130uA 3.3V 480mV@(600mA) 600mA 65dB@(1kHz) 6V Fixed Over Current Protection、Thermal shutdown、Enable control、Output discharge Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSHXLinear Voltage Regulators (LDO)
TS5220A
SMD-4P,5.2x5.2mm-20℃~+80℃ 100 thousand cycles 12V 2.5N 2mm 5.15mm 5.15mm 50mA Gold Gull Wing No Round Button SPST Surface Mount,Vertical Without Bracket SMD-4P,5.2x5.2mm Tactile Switches ROHSSHOU HANTactile Switches
CJ2302
SOT-23-55℃~+150℃ 1 N-channel 1.2V 10nC@4.5V 115mΩ@2.5V 120pF 2.1A 20V 300pF 400mW 80pF N-Channel SOT-23 MOSFETs ROHSJiangsu Changjing Electronics Technology (CJ)MOSFETsCJ2305
SOT-23-50℃~+150℃ 1 P-Channel 12V 190pF 350mW 4.1A 740pF 90mΩ@1.8V SOT-23 MOSFETs ROHSJiangsu Changjing Electronics Technology (CJ)MOSFETsOWPB-909018S-40-03
--40℃~+85℃ 1.8mm 25V 4kHz 77dB 9mm 9mm Passive (Externally Driven) Piezoelectric - Buzzers ROHSOle Wolff Electronics Inc.Buzzers
README
README.mdSAO Digital Multimeter
Additional documentation and build log can be found on the hackaday.io project page for the SAO Digital Multimeter
Features
- Resistance measurement and LED test (including continuity test with a buzzer)
- SAO Input voltage measurement
- SAO GPIO voltage measurement
- I2C info (WIP)
Firmware
This is designed to run CircuitPython and there is a custom build with the needed libraries included, and meaningful pin names for easier development.
A binary build of this is included under firmware/firmware.uf2 and the application code (code.py) and resource files are also in the firmware folder.
Initial programming or CircuitPython updating
- Connect the SAO DMM to a computer usig a USB-C cable and hold down the
Bootbutton, when pressing theResetbutton. - A new drive should show up called
RPI-RP2, and you simply copy thefirmware.uf2file to this drive. - When the copy is done, the device will disconnect and reboot.
- A new drive will show up named
CIRCUITPY, and here you need to copy the remaining files in thefirmwarefolder to the root folder of theCIRCUITPYdevice. - The device will not disconnect, but will do one or more reboots, and after that, you are done.
During this, you might be asked or be blocked by your operating system, as sometimes you will need to verify access to new, unknown devices.
Case and other 3D printed parts
The case and all the button caps, the main knob, and internal spacers to make sure everything sits correctly are designed to be 3D printed with a regular consumer printer. They have been tweaked to be printable with a 0.4mm nozzle, but using a smaller one (eg. 0.2mm) will allow you to use thinner layers, at least in some places, to get a smoother top finnish (top of main knob and top of button caps really benefit from that).
There are also files for a set of 3D printable probes, that are designed to be assembled without any tools, sandwitched around a thin probe wire soldered to a P100-B1 pogo pin for the tip.
There is a .3mf file in the case folder with a project for BambuLab printers, including 5 plates, one for each color needed.
Designed in KiCad v8.99 (nightly)
To open the project, you will need to install a recent nightly build (og v9 or newer when released), KiCad v8 or earlier won't open this design directly.
Electronics schematics as a PDF file is also included for reference.
License
The hardware design (both electronics and 3D designs) of the main branch of this repository is released under the following license:
- the "Creative Commons Attribution-ShareAlike 4.0 International License" (CC BY-SA 4.0) full text of this license is included in the LICENSE file and a copy can also be found at http://creativecommons.org/licenses/by-sa/4.0/
The CircuitPython firmware (including the python application code) is released under the MIT license with smaller dependencies under other licenses as detailed in its LICENSE and LICENSE_MicroPython files.
Parts
326| Qty | Value | Footprint | References |
|---|---|---|---|
| 50 | 100nF | Capacitor_SMD:C_0603_1608Metric | C12, C12, C12, C12, C12, C13, C13, C13, C13, C13, C14, C14, C14, C14, C14, C15 +34 |
| 30 | 10K | Resistor_SMD:R_0603_1608Metric | R2, R2, R2, R2, R2, R5, R18, R18, R18, R18, R18, R19, R19, R19, R19, R19 +14 |
| 25 | 1uF | Capacitor_SMD:C_0603_1608Metric | C1, C1, C1, C1, C1, C2, C2, C2, C2, C2, C3, C3, C3, C3, C3, C7 +9 |
| 20 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C4, C11, C11, C11, C11, C11, C18, C18, C18, C18, C18, C23, C23, C23, C23, C23 +4 |
| 15 | TS5220A | Button_Switch_SMD:SW_SPST_TL3342 | SW1, SW1, SW1, SW1, SW1, SW3, SW3, SW3, SW3, SW3, SW4, SW4, SW4, SW4, SW4 |
| 10 | 100uF | Capacitor_SMD:C_1206_3216Metric | C8, C8, C8, C8, C8, C10, C10, C10, C10, C10 |
| 10 | 10k | Resistor_SMD:R_0603_1608Metric | R16, R16, R16, R16, R16, R17, R17, R17, R17, R17 |
| 10 | 27R | Resistor_SMD:R_0603_1608Metric | R14, R14, R14, R14, R14, R15, R15, R15, R15, R15 |
| 10 | 30pF | Capacitor_SMD:C_0603_1608Metric | C21, C21, C21, C21, C21, C22, C22, C22, C22, C22 |
| 10 | 5.1k | Resistor_SMD:R_0603_1608Metric | R11, R11, R11, R11, R11, R12, R12, R12, R12, R12 |
| 10 | Case | Aesthetics:Case | FRONT, FRONT, FRONT, FRONT, FRONT, SCREEN_SUPPORT, SCREEN_SUPPORT, SCREEN_SUPPORT, SCREEN_SUPPORT, SCREEN_SUPPORT |
| 5 | 100R | Resistor_SMD:R_0603_1608Metric | R1, R1, R1, R1, R1 |
| 5 | 10uF | Capacitor_SMD:C_0603_1608Metric | C6, C6, C6, C6, C6 |
| 5 | 12MHz, 20pF | Crystal:Crystal_SMD_5032-4Pin_5.0x3.2mm | Y1, Y1, Y1, Y1, Y1 |
| 5 | 1k | Resistor_SMD:R_0603_1608Metric | R13, R13, R13, R13, R13 |
| 5 | 330K | Resistor_SMD:R_0603_1608Metric | R8, R8, R8, R8, R8 |
| 5 | 3K3 | Resistor_SMD:R_0603_1608Metric | R3, R3, R3, R3, R3 |
| 5 | 4.7k | Resistor_SMD:R_0603_1608Metric | R9, R9, R9, R9, R9 |
| 5 | 47uH | Inductor_SMD:L_1210_3225Metric | L1, L1, L1, L1, L1 |
| 5 | 4K7 | Resistor_SMD:R_0603_1608Metric | R4, R4, R4, R4, R4 |
| 5 | 6.8k | Resistor_SMD:R_0603_1608Metric | R10, R10, R10, R10, R10 |
| 5 | BLK_GND | TestPoint:TestPoint_Pad_D2.5mm | J2, J2, J2, J2, J2 |
| 5 | Badgelife_sao_connector_v169bis | badgelife_sao_v169bis:Badgelife-SAOv169-SAO-2x3 | X1, X1, X1, X1, X1 |
| 5 | CJ2302 | Package_TO_SOT_SMD:SOT-23 | Q1, Q1, Q1, Q1, Q1 |
| 5 | CJ2305 | Package_TO_SOT_SMD:SOT-23 | Q2, Q2, Q2, Q2, Q2 |
| 5 | HX9193-33GB | Package_TO_SOT_SMD:SOT-23-5 | U1, U1, U1, U1, U1 |
| 5 | LOGO | Aesthetics:HXR_logo_small | G***, G***, G***, G***, G*** |
| 5 | OWPB-909018S-40-03 | Buzzer_Beeper:Buzzer_CUI_CPT-9019S-SMT | LS1, LS1, LS1, LS1, LS1 |
| 5 | QX2304 | Package_TO_SOT_SMD:SOT-23 | U2, U2, U2, U2, U2 |
| 5 | RED_MEASURE | TestPoint:TestPoint_Pad_D2.5mm | J1, J1, J1, J1, J1 |
| 5 | RP2040 | Package_DFN_QFN_Extra:QFN-56_EP_7x7_Pitch0.4mm | U4, U4, U4, U4, U4 |
| 5 | RotaryEncoder | Buttons:EVQ-VV | SW2, SW2, SW2, SW2, SW2 |
| 5 | SSD1306 | Opto:IROP055-SSD1306Z-PADS-ONLY | OLEDM1, OLEDM1, OLEDM1, OLEDM1, OLEDM1 |
| 5 | USB_C | Connector_USB:USB_C_Receptacle_XKB_U262-16XN-4BVC11 | J3, J3, J3, J3, J3 |
| 5 | W25QXX128MBIT | Package_SO:SOIC-8_5.23x5.23mm_P1.27mm | U3, U3, U3, U3, U3 |
The 320 most common of 326 parts.
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Questions
How big is the Panel 1x5 PCB?
It measures 178 × 80 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Panel 1x5 use?
326 parts, built around the RP2040, HX9193-33GB, TS5220A and CJ2302. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Panel 1x5 KiCad files?
From the flummer/dmm-sao repository on GitHub, at the commit this page was made from: the board is dmm_sao/panel_1x5.kicad_pcb and its schematic dmm_sao/dmm_measure.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Panel 1x5 design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).