Yo! This project is still a Work In Progress. Instructions, board layouts and BOM might change!
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- The board has mounting holes and fits the nice box. I would plan a little refine it.
- RFM69 and NRF24L01 SMD footprints
- Separate LDO's for radio and atmega
- Separate 3.3V and 5v i2c buses
- Separate 3.3v and 5v SPI buses (D7 is converted to 3.3v as external CS pin)
- A lot of external pins
- SPI flash and ATSHA204a onboard
- Reverse polarity protection
- A lot of sensors onboard (AM312, bh1750, bmp280, si2101, si1132). I will think about different content sets.
- Only 31mm x 41mm size
- The box has mounting holes from the both sides. So may be I will design additional boards.
Work in progress ;)
| Qty | Value | Device | Package | Parts | Description | MF | MPN | Aliexpress or Ebay link |
|---|---|---|---|---|---|---|---|---|
| 1 | AM312 | U2 | ||||||
| 1 | ATSHA204A | SOT23-3 | U4 | CryptoAuthentication™ Host Security Chip, Industrial (-40 to 85 degC), 3-Pin SOT, Tape and Reel, Pb-Free | ||||
| 1 | ATmega328P-AU | tqfp32 | U1 | 8-bit AVR Microcontroller, 32KB Flash, 1KB EEPROM, 2KB SRAM, 32-pin TQFP, Industrial Grade (-40°C to 85°C) | ||||
| 1 | bh1750 | U7 | ||||||
| 1 | BMP280 | U3 | ||||||
| 2 | BSS138LT1G | SOT23-3 | T1, T2 | N-CHANNEL MOSFET WITH DIODE | ||||
| 9 | 100nF | 100nF | 0402 | C1, C2, C3, C4, C5, C9, C12, C13, C16 | Non-polarised capacitor | |||
| 2 | 4.7uF | 4.7uF | 0805 | C10, C14 | Non-polarised capacitor | |||
| 1 | M25P40-VMN6TPB | sop8 | U5 | 4 Mb (x1) Serial NOR Flash Memory, 75 MHz, 2.3 to 3.6 V, 8-pin SO8 Narrow (MN), Tape & Reel | ||||
| 1 | 100uF | 100uF | A | C17 | Polarised capacitor | |||
| 1 | CJ2301 | SOT23-3 | T1 | P-CHANNEL MOSFET WITH DIODE | ||||
| 1 | HEF4050BT | tssop16 | IC1 | Hex Non-Inverting Buffers | ||||
| 1 | NRF24L01_SMD | 12x16mm | NRF24 | |||||
| 1 | 1M | 1M | 0402 | R3 | Resistor - 1% | |||
| 1 | 100k | 100k | 0402 | R11 | Resistor - 1% | |||
| 4 | 10k | 10k | 0402 | R1, R5, R6, R10, R21 | Resistor - 1% | |||
| 4 | 1k | 1k | 0402 | R2, R7, R8, R9 | Resistor - 1% | |||
| 1 | 470k | 470k | 0402 | R4 | Resistor - 1% | |||
| 1 | rfm69hcw | 16x16mm | M1 | rf69_rev_3.0 16mmx16mm | ||||
| 1 | si7021 | U6 | ||||||
| 1 | xc6206p332mr | SOT23-3 | IC2 | |||||
| 1 | xc6206p502mr | SOT23-3 | IC3 |
| Name | Size | # Downloads |
|---|---|---|
| multibox_1.01.PDF | 312.73 kB | 570 |
| top_board1.gbl | 34.6 kB | 484 |
| slotholes.rpt | 237 B | 429 |
| top_board1.gbo | 204.65 kB | 470 |
| top_board1.gbs | 4.68 kB | 430 |
| top_board1.gm1 | 218 B | 392 |
| top_board1.gtl | 49.59 kB | 444 |
| top_board1.gts | 2.65 kB | 411 |
| top_board1.gto | 218.72 kB | 408 |
| roundholes.drl | 1.92 kB | 385 |
| roundholes.rpt | 272 B | 372 |
| slotholes.drl | 162 B | 372 |