Recent content by hax

  1. H

    FVR 1.024 positive reference question

    It's a 28x2. I think I'll end up using a resistor divider across the 5v power supply. If I have a resistor divider with 3 resistors: 1.8k,1k,1.8k, then I can connect the high part of the 1k resistor to ref+, low side to ref-, and have full 10 bit positive and negative current range within that...
  2. H

    FVR 1.024 positive reference question

    Oh, I just realised that I think I can't use FVR1024 as the positive reference because the analog voltage measured will be higher than 2.5v..... Initially, I thought the command added 1.024V from the negative reference. I might still use the 2.5V sensor wire as the negative reference and use...
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    FVR 1.024 positive reference question

    Hi all, The online manual for the FVR command says "Note that the 1.024V reference may not be accurate if used as the Vref+ of the ADC (only 2.048 or 4.096 should be used for this purpose). " https://picaxe.com/basic-commands/advanced-picaxe-configuration/fvrsetup/ Can anyone elaborate on...
  4. H

    Receiving Hisense TV IR signals. Is this possible?

    Thanks so much IWP! Your code is a fantastic running start. My aim is to get the Hisense remote to control the amp volume. I don't want to keep switching from 1 remote to the other. The amp has an encoder type volume control so I'm hoping to solder wires to the knob and spoof high/low...
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    Receiving Hisense TV IR signals. Is this possible?

    Hi all, Is there a way for any type of picaxe to receive Hisense volume IR commands? I know the irin command receives "Sony" commands but is there maybe a tricky way to get other brands of remote control to work? I only need to receive two buttons from a Hisense TV remote. Volume up and...
  6. H

    external resonator on 28x2 chip

    Sorry guys, I must be going crazy. I thought I bought a 64Mhz resonator, but I was about to post the link to the datasheet of the part i bought, and I realised that I bought the 16Mhz resonator, so all this time, when I was shopping for the resonator, I must have subliminally known that I needed...
  7. H

    external resonator on 28x2 chip

    I am sending Sertxd ("hello") after the setfreq em64 command and both the editor and a third party serial program are picking up the ASCII string at the higher baud rate. I'll confirm what that baud rate is tomorrow. From memory it's 76800 baud.
  8. H

    external resonator on 28x2 chip

    Just tried serial communications, and that all works fine too.... really strange that it works !
  9. H

    external resonator on 28x2 chip

    Hi all, I purchased a 64Mhz resonator, and installed it on my 28x2 picaxe. I used setfreq em64 command in the editor. It accepted a download and it works. But then I remembered that the chips have a 4x PLL phase lock loop and I SHOULD have installed a 16Mhz resonator instead. From the manual...
  10. H

    Serial graphing program

    Just to answer my own question, I tried the aptly named SerialPlot program, and it just works great!
  11. H

    Serial graphing program

    Hi all, I have 8 ADC channels sending a serial string out to the PC. It all works well through the terminal program. Has anyone heard of or found a (free) program that can plot the 8 values on a moving real time graph?
  12. H

    12c communications

    Hi all, I'm working on having two picaxe chips (20x2) communicate with i2c. Things are going well but I have a problem. The master runs this demo code (the final product will have 8 different variables that will change depending on some other sensors): b1=1 b2=2 b3=3 b4=4 init: hi2csetup...
  13. H

    i2c pullups

    Hi all, I want to use a 5V picaxe with a 3.3v i2c device. If I set the pullup i2c resistors to 3.3v instead of 5v I believe it should work. But I just wanted to make sure that the Picaxe works correctly in that it "pulls down" the line to communicate (as required by the standard), and never...
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    Can't download new program after setting setfreq M64

    Hi all, I have a program that is working fine in my Picaxe 20x2 but I can't update the program any more. The picaxe won't take a new download. After the setfreq M64 command, I immediately have a serrxd command. I think what is happening is that the processor is working so fast that it gets to...
  15. H

    ADC external comp pins

    Hi all, I want to use the comparator pins on a 40x2 chip for reading adc10 voltages using an external precision voltage source for best accuracy. The manual says the adcconfig Vref+ pin is A.3 and the Vref- pin is A.2, but in the picaxe pinouts section here...
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