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  1. Replies
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    Help needed with 16F870 ADC

    I am trying to measure a voltage between 2.90V and 4.12V (from a RTD via a differential amplifier[MCP602]), and display this as a number between 0 and 1023.

    My circuit has this voltage on AN0, and...
  2. Thread: ADC Vref

    by srob
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    4,194

    ADC Vref

    Wish to measure three small voltages (<1V) on a 16f676. Set Vref to 1.023V, but found the reading fluctutes with an injected voltage of 100mV on AN1. Checked AN1 ok with internal vref. This raises...
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    This is true presario, and is perfectly adequate...

    This is true presario, and is perfectly adequate for my needs - the circuit needs to trigger an alarm when the ambient temperature falls below zero, and another alarm if the temperature reaches -7...
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    Thanks for the input. Unfortunatly I'm using a...

    Thanks for the input.

    Unfortunatly I'm using a DS18S20, and not DS18B20, so don't think the DIV32 route will work.

    Also, I only used 1's compliment as the LSB is truncated. Basically I wondered...
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    DS18S20 reading negative temperature

    I need to extend the range of the DS18S20 below zero, to one decimal place. My current program uses the "onewire.bas" routine to calculate this:

    ' Calculate temperature in degrees C to 2 decimal...
  6. Thread: Rocket Altimeter

    by srob
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    9,007

    Pressure sensor for rocket

    I built one a couple of years ago to fit Estes BT-50 (or similar) body tubes. I used a freescale MPX2100 pressure sensor

    http://www.freescale.com/files/sensors/doc/data_sheet/MPX2100.pdf?pspll=1...
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    Using port A on the 16F73

    I have a display project that uses a 16F73, and I need to add a GPS reciever and status LED. However the only availible ports are RB7, RA1 and RA3. Unfortunatly RA0 is used as an analogue input while...
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    Thanks for help

    In the end I used the TMR0 timer and wrote the program in assembly (my first attempt at assembly on a PIC!). Using a 32K768Hz crystal, I set the prescalers to 1/256 to give 32Hz, and then counted to...
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    Accurate clock using 12C508

    I need to build a circuit that accurately toggles two outputs (1 high, 1 low) every minute. My initial idea was to use the 1Hz output from a DS1307 RTC, and counting to 60.

    However, I thought a...
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    Thanks. Will just have to had a crystal to the...

    Thanks. Will just have to had a crystal to the parts list!
  11. Thread: vfd

    by srob
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    3,630

    vfd

    Have used hitachi standard VFD in many PIC products without problems.

    I get mine from Farnell.
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    16F628 Internal clock

    I wish to add a frequency counter to a square wave generator (20Hz to 3kHz, TTL) using the COUNT instruction, and to keep it really simple was going to use a 16F628, 8x1 LCD and 100nF decoupling...
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    To sine or not to sine, that is the...

    I wish to use an accelerometer to measure the angle of a rocket launcher (model, that is!) and display the result as degrees (sort of digital spirit level). I am using a +/- 1G accelerometer that...
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    Thanks arniepj. Will give it a try and let you...

    Thanks arniepj. Will give it a try and let you now how I get on
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    If only it were that simple Steve. Have tried...

    If only it were that simple Steve. Have tried sending the 10 bit data and still the same results. The data sheet does say that if 16 bits are sent, the first 6 bits are ignore, but thanks for the...
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    AD7391 digital to analog converter

    Am trying to interface a 16F84 to the AD7391 DAC, but with limited success. I have wired the DAC for unipolar output mode, with a 2.5V reference voltage and I am getting irratic output voltage. Can...
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    PS2/AT Keyboard

    There is a pre-programmed PIC called PAK-VI available from milford instuments. I beleive they cost around £25. I've used them in the past and seems to work fine.
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    PAK-V1a PS/2 coprocessor

    Am building a controller that uses a PS/2 keyboard to input data (the one I using at the moment is a Fujitsu E105). For ease of programming I wish to the above coprocessor.

    Have built the circuit...
  19. Thread: which op-amp?

    by srob
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    2,582

    which op-amp?

    Trying to link a KMC-10 magnetic current sensor to a 16F73 ADC input, but also need a 0 to 10 volt aux output.

    Because the sensor is a bridge (output in mV) am using a classic differential...
  20. Thread: Varitext clock

    by srob
    Replies
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    3,729

    Varitext clock

    Not really a PBP question. But I have a ex-BR station clock (Big red, cluncky thing!), that seems to work ok. Except it requires a serial I/P (time data) to run. Does anyone know the data/protocols...
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    Rugby Clock MSF Receiver

    I am trying to get a 16F84 to communicate with a EM2 MSF receiver module via MCM-RS232 Decoder module, which I got from Maplins (part nos MK68 & MK73), but with out sucess.

    My basic code is as...
  22. Thread: 16c505

    by srob
    Replies
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    2,715

    Thanks Mat

    Thanks Mat
  23. Thread: 16c505

    by srob
    Replies
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    2,715

    16c505

    Can anyone tell me if the 16C505 is compatable with PBP?

    If so, can I use internal clock?

    Thanks again!
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    Isolated A/D converter, SPI I/F

    Am building a circuit that requires two isolated analogue inputs to be recorded, was going to use two CA3162 (A/D to BCD), and opto isolate the 7 outputs to a 16F73.

    However, have come across the...
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