74 lines
2.7 KiB
Markdown
74 lines
2.7 KiB
Markdown
# ATTNode Firmware
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Example Sensor Node Firmware with a BMP/E280 or SHT21 Sensor. Used Sensor has to be set via #define in the src/secconfig.h (HAS_BME280 or HAS_SHT21). Please change the values in src/secconfig.h to your Keys from https://console.thethingsnetwork.org. Device has to be set to ABP Mode and the Frame Counter has to be set to 16 Bit.
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For a complete explanation of the Parameters possible in the secconfig.h see https://www.attno.de/sites/attnode/20-firmware
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The code also supports the RFM69W wireless module instead of the RFM95W LoRa module. For this purpose you need a receiver. Example code for a receiver in python (tested on a Raspberry Pi, RFM69 connected via SPI) can be found at https://www.seiichiro0185.org/git/IOT/sensord
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Project was created using PlatformIO Atmel-AVR Framework
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## Decoder for the TTN Application
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```
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function Decoder(bytes, port) {
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var decoded = {};
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if (bytes.length == 16) {
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// Old Payload Format
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decoded.t = ((bytes[0]) | (bytes[1] << 8 ) | (bytes[2] << 16 ) | (bytes[3] << 24)) / 100.0;
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decoded.p = ((bytes[4]) | (bytes[5] << 8 ) | (bytes[6] << 16 ) | (bytes[7] << 24)) / 100.0;
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decoded.h = ((bytes[8]) | (bytes[9] << 8 ) | (bytes[10] << 16 ) | (bytes[11] << 24)) / 100.0;
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decoded.v = ((bytes[12]) | (bytes[13] << 8 ) | (bytes[14] << 16 ) | (bytes[15] << 24)) / 1000.0;
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} else {
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// New Payload Format
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// We always have Battery Voltage (uint8_t)
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decoded.v = (bytes[0] * 20) / 1000.0;
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// Alarm Triggered (uint8_t)
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if (bytes.length == 2)
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decoded.a = bytes[1];
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// Temperature 2 * DS18B20
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if (bytes.length == 6){
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decoded.t1 = ((bytes[2]) | (bytes[3] << 8 )) / 100.0;
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decoded.t2 = ((bytes[4]) | (bytes[5] << 8 )) / 100.0;
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return decoded;
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}
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// Temperature (int32_t)
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if (bytes.length >= 5)
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decoded.t = ((bytes[1]) | (bytes[2] << 8 ) | (bytes[3] << 16 ) | (bytes[4] << 24)) / 100.0;
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// Humidity (int32_t)
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if (bytes.length >= 9)
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decoded.h = ((bytes[5]) | (bytes[6] << 8 ) | (bytes[7] << 16 ) | (bytes[8] << 24)) / 100.0;
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// Alarm Triggered (uint8_t)
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if (bytes.length == 10)
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decoded.a = bytes[9];
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// SHT21 + Brightness (int16_t)
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if (bytes.length == 11)
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decoded.b = ((bytes[9]) | (bytes[10] << 8 ));
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// Atmospheric Pressure (int32_t)
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if (bytes.length >= 13)
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decoded.p = ((bytes[9]) | (bytes[10] << 8 ) | (bytes[11] << 16 ) | (bytes[12] << 24)) / 100.0;
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// Alarm Triggered (uint8_t)
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if (bytes.length == 14)
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decoded.a = bytes[13];
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// BME280 + Brightness (int16_t)
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if (bytes.length == 15)
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decoded.b = ((bytes[13]) | (bytes[14] << 8 ));
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}
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return decoded;
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}
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```
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## License
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The firmware-code in this repository is licensed under the 3-clause BSD License (see LICENSE-File)
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