https://github.com/kasparsd/passive-sense

https://github.com/kasparsd/passive-sense

attiny84 raspberrypi rfm69 rs485

Last synced: 16 days ago
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• Host: GitHub
• URL: https://github.com/kasparsd/passive-sense
• Owner: kasparsd
• License: mit
• Created: 2018-05-03T19:58:24.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-05-03T20:22:33.000Z (over 6 years ago)
• Last Synced: 2024-10-30T19:46:07.273Z (2 months ago)
• Topics: attiny84, raspberrypi, rfm69, rs485
• Size: 52.7 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 1
• Metadata Files:
  • Readme: readme.md
  • License: LICENSE

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README

        
# Passive Sense

One module that can:

- Transmit and receive sensor data over RFM69 and RS-485.

- Connect RFM69 to Raspberry PI via SPI0.

## Components

- ATTiny84 microcontroller

- RFM69 radio transceiver

- MAX485/MAX1487 RS-485 transceiver

## Connections

RFM69 transceiver to ATTiny84 via USI-SPI since it doesn't have hardware SPI:

- MOSI to PA5 (USI-DO, instead of PA6)

- MISO to PA6 (USI-DI)

- SCK to PA4 (USI-SCK)

- NSS to PB2

- DIO0 to PA7

RFM69 transceiver to Raspberry PI SPI0 header:

- VCC to 3.3V (GPIO9)

- MOSI to MOSI (GPIO10)

- MISO to MISO (GPIO9)

- SCK to CLK (GPIO11)

- NSS to CE (GPIO8)

- DIO0 to GPIO25

MAX485 to ATTiny84 using software serial:

- RO to PA2 as RX

- DI to PA1 as TX

- DE and RE to PA3

## Programming

Via 6-pin ISP connector.

## Layout and PCB

- [Schematics (PDF)](docs/assets/schematics.pdf)

- [PCB (PDF)](docs/assets/pcb.pdf)

See [easyeda.com/kasparsd/tiny-sensor-433mhz-rs485](https://easyeda.com/kasparsd/tiny-sensor-433mhz-rs485).