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CO sensor gone mad

moskovskiy82 25 Dec 2016, 19:48 last edited by

Have around 5 nodes around the house and the latest one completed sends spikes from 50 to 800 ppm almost every minute. The only idea i have - it's happening because of the power supply (MQ-2 attached to the power supplies 5v and GND). Will adding a capacitor help out to smooth out the voltage? And what is the recommended capacity? Have tried already replacing the sensor
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Update RF24 library to latest version
Bug Reports • 23 Mar 2014, 23:37 • andriej 24 Mar 2014, 22:52

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24 Mar 2014, 22:52

@andriej Hi, I had problem using the main branch mysensors/Raspberry, that because of the bit-field struct (header_s) in Sensor.h They will get packed in different order on the arduino compared to the RPi (at least with my compiler, gcc). In order to fix this I created the 1.4dev branch. It uses full bytes instead of the bit-fields, but you need (of cause) to compile both the sensors (arduino) and the gateway (RPi) using the 1.4dev branch. We need to fix this in the main branch later on (and use the same files as in mysensors/Arduino/libraries/MySensors)
Why is the output of ACS712 current measurement module unchanged?
General Discussion • mysensors • 19 Jul 2021, 09:09 • Tessie T 2 days ago

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@ZenBlizzard in case you are measuring the output with a multimeter, you will get an averaged level, since AC current waveform should be sinusoidal and overlapped with the Vcc/2->2.56V in your case. To measure the current you need a decently high sampling and some math. #define SENSITIVITY 66 // mV/A const float readings = 5; const float alpha = 2.0 / (2 * readings + 1); for (ifor = 0; ifor < 250; ifor++) { // Voltage voltageSampleRead = analogRead(V) * vccRead / 1023 - vccRead / 2; /* read the sample value including offset value*/ voltageSampleSum = voltageSampleSum + sq(voltageSampleRead); /* accumulate total analog values for each sample readings*/ voltageSampleOffsetSum = voltageSampleOffsetSum + voltageSampleRead; // Current currentSampleRead = analogRead(I) * vccRead / 1023 - vccRead / 2; /* read the sample value including offset value*/ currentSampleSum = currentSampleSum + currentSampleRead * currentSampleRead; /* accumulate total analog values for each sample readings*/ currentSampleOffsetSum = currentSampleOffsetSum + currentSampleRead; wait(1); } voltageMean = voltageSampleSum / ifor; /* calculate average value of all sample readings taken*/ voltageOffset = voltageSampleOffsetSum / ifor; reading = (sqrt(voltageMean) - voltageOffset) * 230.0 / 1.0; // read voltage / reported voltage. voltage = round_to_dp(alpha * reading + (1 - alpha) * voltage,1); Serial.println(voltage); if (voltage < 25) voltage = 0; currentMean = currentSampleSum / ifor; /* calculate average value of all sample readings taken*/ currentOffset = currentSampleOffsetSum / ifor; reading = (sqrt(currentMean) - currentOffset) / SENSITIVITY * 1000 - currentZeroOffset; // subtract no load current. if (reading < 0) reading = 0; current = round_to_dp( alpha * reading + (1 - alpha) * current,2);
Code Garage to the rescue.
General Discussion • 11 Jan 2025, 11:25 • skywatch 23 Feb 2025, 14:57

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23 Feb 2025, 14:57

I hope the project won't be buried due to the fact that the protocol is the basis of nippy devices (https://nippysmart.com/) I also hope that the development of mysensors won't be directed in 2 directions - one commercial only for nippy - the other for all the rest, which could result in the two versions diverging so much that they will be incompatible and the second one will simply be buried.
Which device I have to use to connect with accelerometer before connecting to my pc?
General Discussion • 24 Jan 2023, 17:16 • Yada Kijsathan 15 days ago

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When connecting an accelerometer to your PC, consider its communication protocol (I2C or SPI) and the appropriate interface device, like a microcontroller (e.g., Arduino). You may also need additional hardware for voltage adjustment or signal conditioning, depending on the sensor’s specifications.
Human presence sensors....
General Discussion • 31 Jan 2025, 10:54 • skywatch 9 Feb 2025, 19:36

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9 Feb 2025, 19:36

@CodeGarage What I want is a lion powered Sensor if possible. And that in a case I can stick to the door frame. As I cannot screw or drill into the doorframe. But I have no idea how much current that draws.
Running out of nodeId's
General Discussion • mysensors • 3 Sept 2024, 07:33 • NielBierman 25 Jan 2025, 17:19

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25 Jan 2025, 17:19

@GLAB You can set the frequencies using the settings in MyConfig.h, which is in the MySensors folder. If you put any of the defines from MyConfig.h into your sketch, they will override the MyConfig.h setting for that sketch only. If you are using the RF24 radio, there are different channels which correspond to a given frequency. The default is channel 76. There is a list of typical channels in MyConfig.h. If you want to change the channel for all the sketches, change it in MyConfig.h. If you want to change it just for the sketch, add a define to the sketch. For example: #define MY_RF24_CHANNEL (84) The problem with changing the channel in a sketch is that the gateway has to be on the same channel to receive from the node. So, normally it makes sense to change in MyConfig.h because you usually want the gateway and all the nodes on the same channel. Other radio's like the RFM69 list the frequency instead of using a channel. They can be overridden in the sketch as well. You can find the defines that are needed in MyConfig.h

CO sensor gone mad

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Update RF24 library to latest version
Bug Reports • 23 Mar 2014, 23:37 • andriej 24 Mar 2014, 22:52

Why is the output of ACS712 current measurement module unchanged?
General Discussion • mysensors • 19 Jul 2021, 09:09 • Tessie T 2 days ago

Code Garage to the rescue.
General Discussion • 11 Jan 2025, 11:25 • skywatch 23 Feb 2025, 14:57

Which device I have to use to connect with accelerometer before connecting to my pc?
General Discussion • 24 Jan 2023, 17:16 • Yada Kijsathan 15 days ago

Human presence sensors....
General Discussion • 31 Jan 2025, 10:54 • skywatch 9 Feb 2025, 19:36

Running out of nodeId's
General Discussion • mysensors • 3 Sept 2024, 07:33 • NielBierman 25 Jan 2025, 17:19

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CO sensor gone mad

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Update RF24 library to latest version Bug Reports • 23 Mar 2014, 23:37 • andriej 24 Mar 2014, 22:52

Why is the output of ACS712 current measurement module unchanged? General Discussion • mysensors • 19 Jul 2021, 09:09 • Tessie T 2 days ago

Code Garage to the rescue. General Discussion • 11 Jan 2025, 11:25 • skywatch 23 Feb 2025, 14:57

Which device I have to use to connect with accelerometer before connecting to my pc? General Discussion • 24 Jan 2023, 17:16 • Yada Kijsathan 15 days ago

Human presence sensors.... General Discussion • 31 Jan 2025, 10:54 • skywatch 9 Feb 2025, 19:36

Running out of nodeId's General Discussion • mysensors • 3 Sept 2024, 07:33 • NielBierman 25 Jan 2025, 17:19

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Update RF24 library to latest version
Bug Reports • 23 Mar 2014, 23:37 • andriej 24 Mar 2014, 22:52

Why is the output of ACS712 current measurement module unchanged?
General Discussion • mysensors • 19 Jul 2021, 09:09 • Tessie T 2 days ago

Code Garage to the rescue.
General Discussion • 11 Jan 2025, 11:25 • skywatch 23 Feb 2025, 14:57

Which device I have to use to connect with accelerometer before connecting to my pc?
General Discussion • 24 Jan 2023, 17:16 • Yada Kijsathan 15 days ago

Human presence sensors....
General Discussion • 31 Jan 2025, 10:54 • skywatch 9 Feb 2025, 19:36

Running out of nodeId's
General Discussion • mysensors • 3 Sept 2024, 07:33 • NielBierman 25 Jan 2025, 17:19

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