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How to handle calibration value ?

Fabien 8 Jan 2017, 21:44 last edited by

With my ORP sensors, I have to calibrate it every years (same for PH probe).
What is the best way to calibrate sensors with MySensors in you opinion ?
Use same child id (for sending data) ? Or another one ?
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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)
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.
Which device I have to use to connect with accelerometer before connecting to my pc?
General Discussion • 24 Jan 2023, 17:16 • Yada Kijsathan 24 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.
Why is the output of ACS712 current measurement module unchanged?
General Discussion • mysensors • 19 Jul 2021, 09:09 • Tessie T 11 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);
ESP-NOW
General Discussion • 220v i recently noticed that expres between esp8266 and es[p which allows direct conection if has released esp-now • 22 Apr 2018, 05:58 • NeverDie 17 Feb 2025, 22:24

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Old topic, I know. Did anything ever come of this? I'm also thinking it would be easy & cheap to get the espnow working as a transport layer. I found this: https://www.mysensors.org/apidocs-beta/classESPNOW.html But it goes above my head and abilities when it comes to code.
Is it possible to extract child ID from a just sent message?
General Discussion • 8 Nov 2021, 09:21 • Nigel31 10 days ago

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It seems you can access the child ID from the sent message by looking at the destination property. If you have the message object, you can extract the ID directly from there.

How to handle calibration value ?

Suggested Topics

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Bug Reports • 23 Mar 2014, 23:37 • andriej 24 Mar 2014, 22:52

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

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

Why is the output of ACS712 current measurement module unchanged?
General Discussion • mysensors • 19 Jul 2021, 09:09 • Tessie T 11 days ago

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General Discussion • 8 Nov 2021, 09:21 • Nigel31 10 days ago

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How to handle calibration value ?

Suggested Topics

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

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

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

Why is the output of ACS712 current measurement module unchanged? General Discussion • mysensors • 19 Jul 2021, 09:09 • Tessie T 11 days ago

ESP-NOW General Discussion • 220v i recently noticed that expres between esp8266 and es[p which allows direct conection if has released esp-now • 22 Apr 2018, 05:58 • NeverDie 17 Feb 2025, 22:24

Is it possible to extract child ID from a just sent message? General Discussion • 8 Nov 2021, 09:21 • Nigel31 10 days ago

7Online

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

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

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

Why is the output of ACS712 current measurement module unchanged?
General Discussion • mysensors • 19 Jul 2021, 09:09 • Tessie T 11 days ago

ESP-NOW
General Discussion • 220v i recently noticed that expres between esp8266 and es[p which allows direct conection if has released esp-now • 22 Apr 2018, 05:58 • NeverDie 17 Feb 2025, 22:24

Is it possible to extract child ID from a just sent message?
General Discussion • 8 Nov 2021, 09:21 • Nigel31 10 days ago

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