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  1. PhilHornby

    Serin Serout issue on 18M2

    I can't find any details of the RF modules you've used - but if the receiver has an 'adjuster' on it, swap it for one that hasn't! (If it is adjustable, when was it last adjusted - and how will you adjust it in future, when it drifts out of spec?). The accepted wisdom seems to be that...
  2. PhilHornby

    Hippy

    He's certainly noticeable by his absence :-(
  3. PhilHornby

    What's next after M2?

    Perhaps you need to ask Microchip, rather than RevEd? The UK Trademark "Picaxe" is owned by "Microchip Technology Incorporated"... (See here)
  4. PhilHornby

    My Old-School Distraction

    I know it was used as the keyboard controller, in the original IBM PC. I remember reacting exactly like that, when I first saw a PC - however, I also failed to form a business and make millions :) . The future was all documented here ;) :- "Now the Chips are down" - BBC Horizon documentary...
  5. PhilHornby

    My Old-School Distraction

    I have to admit, I've never heard of this machine - but I know what that console was inspired by ... ...I could kick myself, for letting one of these get thrown away in the late 1980's :( (You really need the power on and the LEDs illuminated, to get the full effect)
  6. PhilHornby

    C.3 diode to V+ necessary?

    I think you're right - it's presumably for if you're connecting to an olde-worlde RS232C interface, with its 'wild' (non-Picaxe friendly) voltages. Having failed to read that part of the manual, I didn't know it was "required for it work", so I've never connected any such diode :)
  7. PhilHornby

    PCB scope - reviews?

    For working with Analogue signals, that vary with time, you need a 'scope - any scope, being better than no scope :) . That probably fits the bill for your ADC readings, but for the other examples you gave (Serial, IR PWM etc), a Logic Analyser might be more suitable. This web page explains the...
  8. PhilHornby

    Quick Charge 'Trigger' Board.

    What's a Quick Charge Trigger Board, I hear you say :) The Qualcomm Quick Charge protocol is implemented by a variety of 'USB' Chargers and (more interestingly, perhaps) Power Banks. They are intended for 'quickly' charging Mobile phones and Tablets. This is achieved by increasing the voltage...
  9. PhilHornby

    Indicator for the PICaxe Utilisation % or Idle Time

    I've used HSerout, with inverted output, as a replacement for sertxd, which overcomes this problem. It allows for higher baud rates without winding the clock frequency up and is slightly asynchronous (it completes while the last character is still being transmitted). On the 08M2 and 14M2, it...
  10. PhilHornby

    Where's the Wizard ?

    You've already proved it's not that hard :) I'm not convinced that Espressif ever considered the "AT firmware" to be "the product" ... I reckon it was just a demo of the sort of things you could do. When used with Picaxe, the ESP8266 is ideal for implementing a Web Server - with all that flash...
  11. PhilHornby

    HX711 load cell issues

    I'm not familiar with the device, but I was looking at some C++ code that implements an Arduino library for it. The code is quite well commented and might give some clues, as to how to successfully interface with the device...
  12. PhilHornby

    Open Source Ventilator Project

    There's some information on a slightly less ambitious project here: https://github.com/jcl5m1/ventilator
  13. PhilHornby

    Has anybody interfaced the MH-Z19B CO2 sensor

    If that does turn out to be the issue, you can use hserout instead of serout to get the serin started a little sooner. (hserout is slighter asynchronous, in that in completes while the penultimate character is still being transmitted (because of the hardware buffer). It's only 1mS, or so @ 9600...
  14. PhilHornby

    Reset variables when changing SLOT

    A variation on that theme, would be to set Bit 6 of the BORCON SFR, which @hippy documented in this thread:- https://picaxeforum.co.uk/threads/preserving-data-for-after-a-reset-command.29548/
  15. PhilHornby

    Help needed choosing relays

    It's funny how sometimes I just write complete twaddle :oops: What I said might be true of inductors in general, but not motors - when they're not spinning, they are not generating any back EMF, so the supply drives a huge current through their low resistance windings. I suppose the fact the...
  16. PhilHornby

    Has anybody interfaced the MH-Z19B CO2 sensor

    It could be that the reply from device has been and gone, before the Serin even gets executed... Removing the sertxd would help, as would winding up the clock frequency. You may have to switch to hserin or background serial read though ... it just depends how fast this thing responds. A second...
  17. PhilHornby

    Help needed choosing relays

    I just noticed something in the data sheet... "The EVALPWD13F60 is 48 x 53 mm wide, FR-4 PCB resulting in an Rth(J-A) of 18 °C/W, capable to drive loads up to 2 A RMS, without forced airflow cooling. " You might need a small fan! Perhaps an old CPU, or 'Northbridge' cooler? I wonder if you're...
  18. PhilHornby

    Help needed choosing relays

    So, the plan is to stick with the original controller and reverse its (i.e. the controller's) 230V DC output with something interposed between it and the motor. The controller already performs speed control, via an analogue control - which you intend to interface to the Picaxe via PWM. (Just...
  19. PhilHornby

    Help needed choosing relays

    I found a GMD118-1 motor, listed on Gumtree (of all places). There's a photo showing a motor and a controller board, for those of us unfamiliar with it. Are you using the controller board that came with the motor? If so, does the motor actually reverse when the supply to the controller is...
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