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moonguru

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  • Use NRF24L01 Wireless in Your Projects

    We can’t connect to the server at smartmicrocontroller.com.This is the message I get when I try to download the code

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  • Low Cost Wireless Sensor Network on 433MHz Band

    Inspired by Andrei Erdie's instructable entry "Low Cost Wireless Sensor Network on 433MHz Band", I made a version of it and used his ideas to make a successful network. Because I only needed temperature and not humidity, I used DS18B20 sensors. My network is a lot smaller only needing about 4 remote senders for my small greenhouse plastic boxes. The receive side uses a TFT display to show all the temperature and sensor ID information in four lines rather than the monitor display. The attached photo shows one sender unit with the DS18B20 sensor in a small box. I also have another waterproof DS18B20 sensor that is connected to the sender box via a lead. I am pleased with this system as it provides a cheap and useful monitoring system that suits my requirements. I had to make some…

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    Inspired by Andrei Erdie's instructable entry "Low Cost Wireless Sensor Network on 433MHz Band", I made a version of it and used his ideas to make a successful network. Because I only needed temperature and not humidity, I used DS18B20 sensors. My network is a lot smaller only needing about 4 remote senders for my small greenhouse plastic boxes. The receive side uses a TFT display to show all the temperature and sensor ID information in four lines rather than the monitor display. The attached photo shows one sender unit with the DS18B20 sensor in a small box. I also have another waterproof DS18B20 sensor that is connected to the sender box via a lead. I am pleased with this system as it provides a cheap and useful monitoring system that suits my requirements. I had to make some software changes to suit but I incorporated the original ideas such as the anti clash approach.

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  • Low Cost Wireless Sensor Network on 433MHz Band

    With the receive side, I got interference from a commercial indoor/outdoor wireless thermometer. I also got interference from a wireless doorbell. However, a little bit of s/w got rid of most interference for my system based on your approach making it quite usable. Systems like this would be fine in a greenhouse isolated from these interfering sources. As RadioHead doesn't seem to work with an ATtiny85, I cannot compare it with RCSwitch. RadioHead may be better at rejecting interfering signals?Incidently, I tried a system based on a DS18B20 and using you approach but just using temperature and sensor ID information (humidity not needed) and works good.

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  • Low Cost Wireless Sensor Network on 433MHz Band

    I am very impressed with this project, so well documented and explained. I notice in your Tx circuit there is a 5.1k resistor missing from the data line of the DHT11 to Vcc?I would like to substitute the DHT12 for the DHT11 so that temperatures below Zero can be measured as well as getting improved accuracy. As the DHT12 uses an I2C bus with SDA and SCL compared to the DHT11 which just uses a single serial line, would there be much change to the software to suit the ATtiny85? If this is not possible then maybe I should try a DS18B20 as I only require temperature and not humidity?

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  • In the DS3231 all I do is remove the 200 ohm resistor in the charging circuit. This will prevent charging a non rechargeable battery and avoid any danger.

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  • Thanks andrei, I installed Arduino 1.8.8 and ATTinycore but at first it still failed to compile but I went very carefully over my ATTiny core hardware installation and now it compiles without errors. Thanks for your help.

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  • I still get an error when I compile with the RCSwitch library.error: 'digitalPinToInterrupt' was not declared in this scopeHow can I get around this?

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  • I also have an error in the Tx library file as follows.C:\Users\user\Dropbox\Arduino\libraries\rc-switch-protocollessreceiver\RCSwitch.cpp:550:32: error: 'digitalPinToInterrupt' was not declared in this scope if (digitalPinToInterrupt(i) == interrupt) {

    I had no success with the Adafruit library DHT-sensor-library-master so I went to Rob Tillart/Arduino library Arduino/libraries/DHTstable. As there is no zip download I had to create folder DHTstable in my Arduino library and copy and paste dht.cpp and dht.h in it. This seemed to work ok. Note that Adafruit uses DHT while Rob uses dht.I am using Arduino 1.6.8 so I will upgrade soon. I was also using 8MHz internal clock. Incidently, in other projects I have used RadioHead for 433MHz communication. Maybe it would be too large for this project?

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  • I installed the library DHT-sensor-library-master from Github and I get the following errors for the ATtiny85 Tx.Is this the library I should use?C:\Users\user\AppData\Local\Temp\arduino_modified_sketch_408022\sketch_jul19b.ino:2:92: fatal error: dht.h: No such file or directory #include <dht.h> // https://github.com/RobTillaart/Arduino/tree/maste...

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  • moonguru followed RoyPeer
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  • Works well.Could a DS3231 be substituted in place of the DS1307?

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