Yo! This project is still a Work In Progress. Instructions, board layouts and BOM might change!
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Make a donation to csabarThis is a MAX485 shield for Arduino Pro Mini, which can be connected easily by pin headers. With the screw terminal, it is easy to connect to the twisted-pair bus. The item at the end of the bus can be terminated using a jumper.
The idea came when I saw the popular cheap MAX485 boards, which are hard to connect and have much bigger footprint. With this shield you can create a cheap decentralized wired home automation network. Due to its small footprint it is possible to install in small junction box.
Price of the components + PCB is around $2.20
| Reference | Quantity | Value | Footprint | Datasheet | Aliexpress link | Unit price $ |
|---|---|---|---|---|---|---|
| C1 | 1 | 10u/16V | Capacitors_SMD:C_1206 | AliExpress: 1206 SMD capacitor 10UF 106K ±10% 25V 100p... | 0.02 | |
| C2 | 1 | 100n/16V | Capacitors_SMD:C_0603 | AliExpress: https://www.aliexpress.com/item//1727377024.html | 0.01 | |
| J1 J2 | 2 | Screw_Terminal_1x02 | Connectors_Terminal_Blocks:TerminalBlock_Pheonix_MPT-2.54mm_2pol | AliExpress: 50 pcs Universal 2.54 mm Pitch 2 Pin 3 4 5 6 7 8... | 0.20 | |
| J3 | 1 | CONN_01X03 | Pin_Headers:Pin_Header_Straight_1x03_Pitch2.54mm | AliExpress: Hot Sale 10pcs 40 Pin 1x40 Single Row Male 2.54 ... | 0.004 | |
| J4 | 1 | CONN_01X06 | Pin_Headers:Pin_Header_Straight_1x06_Pitch2.54mm | 0.008 | ||
| JP1 | 1 | Jumper | Pin_Headers:Pin_Header_Straight_1x02_Pitch2.54mm | 0.003 | ||
| JP2 | 1 | Jumper_NC_Dual | Connectors:GS3 | 0.00 | ||
| R1 | 1 | 120R | Resistors_SMD:R_0603 | 0.003 | ||
| R2 R3 R4 R5 | 4 | 10k0 | Resistors_SMD:R_0603 | AliExpress: https://www.aliexpress.com/item//32359683117.htm... | 0.003 | |
| R6 R7 | 2 | 20k | Resistors_SMD:R_0603 | 0.003 | ||
| TP1 | 1 | TEST | Measurement_Points:Measurement_Point_Round-SMD-Pad_Small | 0.00 | ||
| U1 | 1 | MAX485E | Housings_SOIC:SOIC-8_3.9x4.9mm_Pitch1.27mm | https://www.analog.com/media/en/technical-documentation/data... | AliExpress: https://www.aliexpress.com/item//32355724259.htm... | 0.60 |
| Name | Size | # Downloads |
|---|---|---|
| rs485-F.Mask.gts | 850 B | 399 |
| rs485-F.Cu.gtl | 14.86 kB | 370 |
| rs485-F.Paste.gtp | 276 B | 386 |
| rs485-F.SilkS.gto | 12.65 kB | 411 |
| rs485.drl | 399 B | 355 |
| rs485-B.Mask.gbs | 1.84 kB | 453 |
| rs485-B.Cu.gbl | 27.37 kB | 435 |
| rs485-B.Paste.gbp | 1.23 kB | 436 |
| rs485-Edge.Cuts.gm1 | 515 B | 427 |
| rs485-B.SilkS.gbo | 12.09 kB | 434 |
| rs485.net | 10.29 kB | 408 |
| rs485.kicad_pcb-bak | 100.13 kB | 447 |
| rs485.sch | 8.5 kB | 533 |
| rs485.kicad_pcb | 100.13 kB | 431 |