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Hi Klaus,
It turns out my scope was aliasing the signal as the sample rate was too low. I set a quicker sample rate and got the required waveforms. Sample below:
I analysed these waveforms based on your comments and it turns out that I was sending a write command which I didn't need to send...
Hi,
The first thing I would probably suggest to do is get yourself a Small computer like the others have suggested - Raspberry Pi, Beagle Bone etc which are based on Linux (if this what you prefer). There are plenty of tutorials on how to interface sensors, add drivers to existing kernels etc...
Hi Klaus,
Sorry for the bad scope picture. I zoomed in and got the transitions, however the waveforms are noisy:
From this I can make out a few things like the first data that I am sending is 0x70 and which I think is as marked in the below picture:
Am I right? Please let me know.
Hi Klaus,
Please find the snapshot of the scope below:
The part of the code that I use to read the sensor is below:
Let me know if this is ok. Thanks
Faizan.
Hi All,
I am trying to interface the SHTW2 sensor from Sensirion with the nordic nrf52810 mcu. The Sensor uses I2C to communicate and nordic has its own version of I2C called TWI. From the datasheet of the sensor, The flow to get successful measurement is as follow:
I am able to send the data...
Hi Klaus,
I checked the connections and they seem fine. I'll try with another capacitor just in case. But I think I'm supposed to get he 12 V DC voltage because it says so in the power requirements sheet of the sensor - Attached image.
Faiz
Hi Klaus,
Oops. The indication in the second schematic is wrong. I connected it in the right way according to the first schematic. Thanks for pointing that out.
If I use 15 Kohm then I get a bias voltage of 12 V at the o/p. So if I connect this circuit directly to an ADC then won't the 12V be...
Hi Klaus,
Let's start with what I have done so far:
The sensor has an accelerometer and a temperature sensor and requires a constant current excitation to function. So we use the CRD for this purpose. For the accelerometer, which I will be using as a vibration sensor, the sensitivity is 100...
Hi Klaus,
Thank you for the reply and sorry for the late response.
Frankly, I don't yet have a complete circuit. I thought I could start first by just measuring the raw voltage values using an oscilloscope or a multi-meter after connecting the circuit as per the image I sent.
I used the...
Hi all,
I am working on a project that involves using a 1-axis (if I'm not wrong) accelerometer for vibration sensing called TA102 by CTC. This sensor also gives a temperature reading. All this data I send over the network to a gateway. But I am having trouble measuring or making sense of the...
Hi FvM,
Thank you for the quick reply. I had a look at the previous posts but I still have some missing pieces.
I am trying to get a constant current source using the above schematic. To output a current of 1 mA from an input voltage of 3.3V, I believe I need to have matching resistors for...
Hi All,
I am working on a project to sense the temperature using RTDs (Resistance Temperature detectors). I need some help in understanding the circuit attached. I am using this to excite a RTD sensor in order to measure the voltage across it that I can later correlate to temperature.
Also are...
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