IO NRF
About the IO NRF PCB
IO NRF is an open source AVR/Arduino PCB design by crlab3, published on GitHub. It is a 2-layer board measuring 79 × 49.9 mm, with 38 components from 22 distinct parts.
Its main chip is the ATtiny84-20SS, from the AVR/Arduino family. Other key parts include the NRF24L01_Breakout, AP7370-33WW-7 and TLP291. By type, the board carries 12 resistors, 7 capacitors, 5 ICs, 5 connectors, 4 diodes and 2 transistors.
From the project
Latest version of IONRF & ESP32 OBD platform.
Main components on the IO NRF
IO NRF bill of materials (BOM)
38 components, 22 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | NRF24L01_Breakout | PinHeader_2x04_P2.54mm_Vertical | U1 |
| 1 | AP7370-33WW-7 | SOT-23-5 | U2 |
| 1 | ATtiny84-20SS | SOIC-14_3.9x8.7mm_P1.27mm | U3 |
| 2 | TLP291 | SOIC-4_4.55x2.6mm_P1.27mm | U4, U5 |
| 2 | BC817 | SOT-23 | Q1, Q2 |
| 1 | 12V_IN | SORKAPOCS-3.5mm-2 | J1 |
| 1 | Programmer_Pins_SPI | PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | External_Outputs_Terminal | SORKAPOCS-3.5mm-12 | J3 |
| 1 | External_Inputs_Terminal | SORKAPOCS-3.5mm-2 | J4 |
| 1 | XKC-Y2S-IN | PinSocket_1x04_P2.54mm_Vertical | J5 |
| 1 | 100mA Polyfuse | Fuse_1210_3225Metric_Pad1.42x2.65mm_HandSolder | F1 |
| 2 | ST2002C12W | ST2002C12W | K1, K2 |
| 3 | DO-214AC | D_SMA | D1, D2, D3 |
| 1 | LED | LED_0603_1608Metric | D4 |
| 1 | 10uF | C_1210_3225Metric | C1 |
| 1 | 47uF | CP_Elec_6.3x5.4 | C2 |
| 1 | 4.7uF | C_0805_2012Metric | C3 |
| 3 | 100nF | C_0603_1608Metric | C4, C5, C7 |
| 1 | C_Polarized | CP_Elec_5x5.3 | C6 |
| 8 | 1k | R_0805_2012Metric | R1, R2, R3, R8, R9, R10, R11, R12 |
Show 2 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 10k | R_0805_2012Metric | R4, R5 |
| 2 | 4.7k | R_0805_2012Metric | R6, R7 |
IO NRF design files
The KiCad project lives in the crlab3/OBD_IONRF_ESP32 repository on GitHub; these links point at the commit this page was built from.
- LayoutIO_NRF/IO_NRF.kicad_pcb
- SchematicIO_NRF/IO_NRF.kicad_sch
IO NRF: common questions
What microcontroller does the IO NRF use?
The IO NRF is built around the ATtiny84-20SS, from the AVR/Arduino family.
How big is the IO NRF PCB?
The IO NRF measures 79 × 49.9 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the IO NRF?
38 components, from 22 distinct parts. The full bill of materials is listed on this page.
Where can I download the IO NRF design files?
From the crlab3/OBD_IONRF_ESP32 repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the IO NRF design in my own project?
The repository has no license, so all rights stay with crlab3. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the IO NRF 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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