Remote unit
About the Remote unit PCB
Remote unit is an open source AVR/Arduino PCB design by danielmcmillan, published on GitHub under the MIT license. It is a 2-layer board measuring 94 × 56.3 mm, with 47 components from 29 distinct parts.
Its main chip is the ATmega328P-AU, from the AVR/Arduino family. Other key parts include the DRV8870DDA, TPS54331DR and MAX3485. By type, the board carries 16 capacitors, 15 resistors, 5 ICs, 4 transistors, 4 diodes and 1 crystal.
From the project
Hardware and software for irrigation control and monitoring
"irrigation-controller" contains the KiCad project for the central control board.
"remote-unit" contains the KiCad project for the remote solenoid control board.
Some project-specific symbols and footprints are saved in the lib dir.
This external symbol and footprint is used with name "TPS54331DR": https://octopart.com/tps54331dr-texas+instruments-12190905
Main components on the Remote unit
Remote unit bill of materials (BOM)
47 components, 29 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | ATmega328P-AU | TQFP-32_7x7mm_P0.8mm | U1 |
| 2 | DRV8870DDA | Texas_HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.4x3.1mm_ThermalVias | U2, U3 |
| 1 | TPS54331DR | Texas_Instruments-TPS54331DR-Level_A | U4 |
| 1 | MAX3485 | MSOP-8_3x3mm_P0.65mm | U5 |
| 1 | N >1A@4VGS | SOT-23 | Q1 |
| 1 | PNP | SOT-23 | Q2 |
| 1 | VGS<-14v | SOT-23 | Q3 |
| 1 | NPN | SOT-23 | Q4 |
| 1 | 8MHz | Crystal_SMD_5032-2Pin_5.0x3.2mm | Y1 |
| 1 | Fuse_Small | Fuse_0603_1608Metric | F2 |
| 2 | 550mV 1A | D_SMA | D1, D4 |
| 2 | LED | LED_0603_1608Metric | D2, D3 |
| 1 | 33uH | L_8x8mm_H4mm | L1 |
| 8 | 100nF | C_0603_1608Metric | C2, C3, C4, C5, C6, C7, C11, C16 |
| 2 | 22pF | C_0402_1005Metric | C8, C9 |
| 2 | 10uF | C_1206_3216Metric | C10, C12 |
| 1 | 10pF | C_0603_1608Metric | C13 |
| 1 | 8.2nF | C_0603_1608Metric | C14 |
| 1 | 1.5nF 25V | C_0603_1608Metric | C15 |
| 1 | 22uF 6.3V | C_0603_1608Metric | C17 |
Show 9 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 10k | R_0402_1005Metric | R1, R5, R13 |
| 1 | 5.1M | R_0603_1608Metric | R2 |
| 1 | 390k | R_0603_1608Metric | R3 |
| 1 | 20k | R_0402_1005Metric | R4 |
| 2 | 3k | R_0603_1608Metric | R6, R12 |
| 2 | 330 | R_0402_1005Metric | R7, R8 |
| 2 | 220k | R_0603_1608Metric | R9, R10 |
| 1 | 750 | R_0603_1608Metric | R11 |
| 2 | 100m | R_2512_6332Metric | R14, R15 |
Remote unit design files
The KiCad project lives in the danielmcmillan/irrigation-system repository on GitHub; these links point at the commit this page was built from.
Remote unit: common questions
What microcontroller does the Remote unit use?
The Remote unit is built around the ATmega328P-AU, from the AVR/Arduino family.
How big is the Remote unit PCB?
The Remote unit measures 94 × 56.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Remote unit?
47 components, from 29 distinct parts. The full bill of materials is listed on this page.
Where can I download the Remote unit design files?
From the danielmcmillan/irrigation-system repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Remote unit design in my own project?
Yes, under the terms of its MIT license, which danielmcmillan chose for the repository.
Can I test firmware for the Remote unit 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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