A2R-100k
About the A2R-100k PCB
A2R-100k is an open source AVR/Arduino PCB design by mgiesen, published on GitHub. It is a 2-layer board measuring 68 × 23 mm, with 20 components from 15 distinct parts.
Its main chip is the ATTINY85-20PU, from the AVR/Arduino family. Other key parts include the MCP41HV51-104E/ST and HT7550-1_C347189. By type, the board carries 6 connectors, 6 capacitors, 3 ICs, 3 resistors, 1 fuse and 1 diode.
From the project
Universeller Signalwandler: Analoges Steuersignal (0-10V / 0-5V / 4-20mA) → einstellbarer Widerstand (100kΩ). Ersetzt mechanische Potentiometer in 12V/24V Systemen.
Dieses Modul ist ein universeller Signalwandler, der analoge Steuersignale (0-10 V / 0-5 V / 4-20 mA) in einen galvanisch isolierten, einstellbaren Widerstandswert übersetzt.
Es dient als elektronischer Ersatz für klassische mechanische Potentiometer und ermöglicht es, rein analoge Schaltungen, die bisher manuell bedient wurden, in moderne, automatisierte Regelkreise zu integrieren.
Main components on the A2R-100k
A2R-100k bill of materials (BOM)
20 components, 15 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MCP41HV51-104E/ST | TSSOP-14_L5.0-W4.4-P0.65-LS6.4-BL | U1 |
| 1 | ATTINY85-20PU | PDIP-8_L9.3-W6.4-P2.54-LS7.9-BL-1 | U2 |
| 1 | HT7550-1_C347189 | SOT-89_L4.5-W2.5-P1.50-LS4.2-BR | U3 |
| 3 | ~ | PinHeader_1x02_P2.54mm_Vertical | J1, J2, J3 |
| 1 | Lötpunkte | PinHeader_1x04_P2.54mm_Vertical | J4 |
| 1 | WJ500V-5.08-2P-14-00A | CONN-TH_2P-P5.00_WJ500V-5.08-2P | P1 |
| 1 | WJ500V-5.08-3P-14-00A | CONN-TH_3P-P5.00_WJ500V-5.08-3P | P2 |
| 1 | C209735 PPTC | F1206 | F1 |
| 1 | D_Zener | SOD-123FL_L2.8-W1.9-LS3.7-RD | D1 |
| 2 | 0.1 µF | C_0805_2012Metric | C1, C2 |
| 2 | 10 µF | C_0805_2012Metric | C3, C4 |
| 1 | 10 µF | C_1206_3216Metric | C5 |
| 1 | 10NF 10nF | C_0805_2012Metric | C6 |
| 2 | 10K 10k | R_0805_2012Metric | R1, R2 |
| 1 | 249 | R_1206_3216Metric | R3 |
A2R-100k design files
The KiCad project lives in the mgiesen/A2R-100k repository on GitHub; these links point at the commit this page was built from.
A2R-100k: common questions
What microcontroller does the A2R-100k use?
The A2R-100k is built around the ATTINY85-20PU, from the AVR/Arduino family.
How big is the A2R-100k PCB?
The A2R-100k measures 68 × 23 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the A2R-100k?
20 components, from 15 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 A2R-100k design files?
From the mgiesen/A2R-100k 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 A2R-100k design in my own project?
The repository has no license, so all rights stay with mgiesen. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the A2R-100k without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.
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