Hello, I've been visiting this site so much over the last year. I'm studying a level 3 btec extended diploma. I'm currently in my 2nd year and working on my project.
My project is to make a security light which is triggered by a hb100 microwave sensor but I'd like to add more variables with an arduino aswell, such as the light will only come on if the sensor detects movement and another condition is also met, such as the time and a pir sensor. However I'm in the early stages and struggling with the preamplifier. My teachers are confused by my project in think they are put off as they have never seen this sensor before.
I have built a 2 stage preamplifier using a lm324.
I have tested the amplifier by applying a 100hz signal at 30mV, and observed around 2.5V peak to peak output.
Am I right in thinking I should be seeing 5V output for the amplifier stage so the arduino can work with the signals?
Also I am having a problem when I connect the microwave sensor. The output signals are still tiny, in the mV range.
Many other projects I see have a VOUT and FREQ OUT. however the documentation for the HB100 only specifies OUTPUT... I'm assuming it's frequency.
I have seen projects done with this sensor before and I'm still unclear, I hope there is somebody who can explain why I am only seeing tiny signals on the output when the circuit is in operation, as that is my main challenge.
I cannot seem to upload my pictures from my phone, I'll upload the documents I am using, now.
Thanks
My project is to make a security light which is triggered by a hb100 microwave sensor but I'd like to add more variables with an arduino aswell, such as the light will only come on if the sensor detects movement and another condition is also met, such as the time and a pir sensor. However I'm in the early stages and struggling with the preamplifier. My teachers are confused by my project in think they are put off as they have never seen this sensor before.
I have built a 2 stage preamplifier using a lm324.
I have tested the amplifier by applying a 100hz signal at 30mV, and observed around 2.5V peak to peak output.
Am I right in thinking I should be seeing 5V output for the amplifier stage so the arduino can work with the signals?
Also I am having a problem when I connect the microwave sensor. The output signals are still tiny, in the mV range.
Many other projects I see have a VOUT and FREQ OUT. however the documentation for the HB100 only specifies OUTPUT... I'm assuming it's frequency.
I have seen projects done with this sensor before and I'm still unclear, I hope there is somebody who can explain why I am only seeing tiny signals on the output when the circuit is in operation, as that is my main challenge.
I cannot seem to upload my pictures from my phone, I'll upload the documents I am using, now.
Thanks
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