nathanchantrell / tinytx

ATtiny84 & RFM12B wireless sensor node

#TinyTX - An ATtiny84 and RFM12B wireless sensor node

By Nathan Chantrell. For hardware design see http://nathan.chantrell.net/tinytx

Licenced under the Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) licence: http://creativecommons.org/licenses/by-sa/3.0/

Code for TinyTX nodes

##TinyTX_DS18B20 With DS18B20 temperature sensor.

##TinyTX_DHT22 With DHT22 temperature & humidity sensor.

##TinyTX_TMP36 With TMP36 Analogue Temperature Sensor.

##TinyTX_LDR_Meter
With LDR to read LED pulses on electricity meter.

##TinyTX_LDR With LDR to read light levels.

##TinyTX_ReedSwitch Detect a normally closed reed switch opening and closing with pin change interrupt to wake from sleep.

##TinyTX_Hall_Effect_Gas Using an A3214EUA-T or A3213EUA-T Hall Effect Sensor to read the pulse magnet on a gas meter.

##TinyTX_Rain_Gauge Using a tipping bucket rain gauge with a reed switch to indicate each tip. A pin change interrupt is used to wake the TinyTX

##TinyTX_Water A leak/flood sensor using the TinyTX, a 100K resistor and two wire probes. See below for a receiver.

##TinyTX_SRF_DS18B20 Version using the Ciseco SRF radio (http://shop.ciseco.co.uk/srf-wireless-rf-radio-surface-mount/) instead of the RFM12B Uses the SoftEasyTransfer library to send checksummed typedef structs (https://github.com/madsci1016/Arduino-EasyTransfer/) This is transmit only for now as receive requires a hardware modification to the TinyTX.

##TinyTX_OOK_DS18B20 Version using a cheap OOK/ASK radio and Manchester encoding. This is transmit only as these cheap radios are only transmitters.

Code for receiving end

##OSWIN ATMega1284P Emoncms gateway code For the code I am currently using on my gateway node see the separate repository here: https://github.com/nathanchantrell/oswin This support the RFM12B, SRF and OOK nodes. More info on OSWIN here: http://nathan.chantrell.net/oswin/

##TinyTX_RX_Simple A simple receive example for RFM12B nodes, outputing received data on the serial monitor.

##TinyTX_NanodeRF_emoncms For the Nanode RF (http://www.nanode.eu/) to upload multiple RFM12B nodes to emoncms

##TinyTX_NanodeRF_Cosm Nanode RF example to upload data from a single RFM12B TinyTX to http://cosm.com

##TinyTX_MAX1284_emoncms For the MAX1284 internet gateway (http://max1284.homelabs.org.uk/) to upload multiple RFM12B nodes to emoncms

##TinyTX_Water_RX Receiver example for the leak/flood sensor above, can be run on a Tiny TX and brings D9 high on a water alarm and D10 high on a low battery alarm. Could be used to trigger an external device, sound a buzzer etc. Same code could also be used on a Nanode/WiNode etc.

##TinyTX_SRF_RX_Simple Simple receive example for the SRF version.

##TinyTX_OOK_RX_Simple Simple receive example for the OOK version.

tinytx's Issues

RIP Nathan

https://twitter.com/HD41117/status/1336524397721624577

Nathan's work inspired me for many years, so I am going to release an updated version of TinyTX4 over this year:

https://github.com/amadeuspzs/TinyTX

BEM280 and tinyTX with I2C wiring possible?

Is it possible to drive a tinyTX wit a BEM280 sensor with I2C wiring? Has anybody already tried it?

Writing on attiny84 dht22.ino

Hello there!

I have downloaded all requirements from TinyTX tutorial page and I can write bootloader with no problems.
When I try to write dht22.ino I get an error:

'Sleepy' has not been declared.

I've tried to copy the includes (DHT22.h and JeeLib.h) in the sketch folder but the error remains the same.

What am I doing wrong?

Recommendation to decrease power consumption.

Set the reed pin from falling to rising
Set pin as input.
Connect the reed to vcc instead of ground and put a 1M resistor between pin and ground.
In your case I see a 100uA consumption on close state. In my case the consumption is dropping around 4uA.

verify met error message

Hi Nathan Chantrell,
First of all thank you for sharing your experience
I made reference to TinyTX_nRF24L01_DS18B20.ino, and want to try to replicate the same situation
But I encountered at compile time error
I have tried to install the following library is still the same
DallasTemperature
mirf85
Narcoleptic
OneWire
RF24
SPI85
maybe I have missed what place?
Could you please help me? Thank you

digitalWrite(ONE_WIRE_GND, LOW); // set GND pin low <-------Verify error messages stay in this line

IF ended too early

Hi Nathan,

I'm still new with github and not sure how to pull to your repo - but I have found a minor error in your/my code (TinyTX_LDR_Meter.ino), which produces an error if less than 1000 (in this case) millis since last blink.

...
    } else if (interval > 1000) { // 1+ sec passed
        // Blinks are 1000 per kWh, or 1 Wh each
        // One hour has 3.6M milliseconds
        watts = nBlinks * 1 * 3.6E6 / interval;

        last = time;
        nBlinks = 0;
    }

  tinytx.power = watts; // Get realtime power

  tinytx.supplyV = readVcc(); // Get supply voltage

  rfwrite(); // Send data via RF    

    }

}

Needs to be changed to:

...
    } else if (interval > 1000) { // 1+ sec passed
        // Blinks are 1000 per kWh, or 1 Wh each
        // One hour has 3.6M milliseconds
        watts = nBlinks * 1 * 3.6E6 / interval;

        last = time;
        nBlinks = 0;

  tinytx.power = watts; // Get realtime power

  tinytx.supplyV = readVcc(); // Get supply voltage

  rfwrite(); // Send data via RF    

      }

    }

}

Kind regards,
Troels