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Recent content by iamdink

  1. I

    Interupt for peripherals

    Thanks for help Jack. Alternatively I can use I2C interface which can has a special interrupt built in for asynchronous operation.
  2. I

    Interupt for peripherals

    bobcat and 123jack: I'm using an SPI interface for my ADC. I have 4 sensor inputs for my ADC's. What I planned was to setup 4 16-bit timers set to poll threads. Each of these individual poll threads would have bus-safe logic to poll ADC. The ADC read call is blocking and will sit and wait...
  3. I

    Interupt for peripherals

    I'd like to use timer driven interrupts for some of my peripheral components. I need to update 4 DAC on an I2C bus and also 2 gain values for PGA on SPI bus. I need to receive 2 ADC updates on an SPI interface. I figured I'd move I2C in one low time interrupt. No need to worry about devices...
  4. I

    Noise performance on sensors

    With regards to the I2C. Yes I like this approach better as single bus can be distributed. When you quote 1m, for what voltage is device operating at? I'm using 3.3v logic so I really wonder if +5 is quoted for 1m. I guess for longer network you might want to use CAN. High bit rate for...
  5. I

    need help with a photodiode & opamp circuit

    You should use differential opamp setup to remove CM noise. These are very common and used many places. https://en.wikipedia.org/wiki/Operational_amplifier_applications#Differential_amplifier I often provide gain in a first stage then used the differential amplifier stage to remove the CM.
  6. I

    Noise performance on sensors

    keith1200rs, thank you for response. I just wonder if it's worth the extra effort. I'd be supplying 5 lines (SCLK, SDA, VCC, GND, and CS) as opposed to 2 (VCC and GND). I think if you were in an noisy RF setting it might make sense where the long transmission line would be an antenna.
  7. I

    Noise performance on sensors

    Hello all, I have a question which I was thinking of. Most sensors have some sort of gain stage to bring a small signal out of nosie. If a sensor is good deal from processor then a twisted pair is used to bring signal into the processor. Has anyone built a circuit with sensor, gain stage...
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