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    Digital logic on noisy lines

    I need to send 8 lines of digital logic over some long wires; 20 to 100 metres perhaps, as part of a security system. PICAXEs will be at either end. The lines are in a domestic environment but may be passing a variety of other cables, mainly mains cables, washing machines and so forth, and...
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    Body diode in MOSFET

    I am proposing to switch 12V AC at around 500mA using this a PICAXE in this configuration; This involves using the body diode of the MOSFET to conduct and I find it difficult to get full specs on the body diode from many MOSFET datasheets. Clearly, the maximum current capability of the body...
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    Triggering PICAXE inputs with photointerrupters

    I need to use photointerrupters as limit switches on a PICAXE project. The ideal size of device for my project appears to be met by the GP1S094HCZ0F from Sharp. (datasheet- http://docs-europe.electrocomponents.com/webdocs/0d1b/0900766b80d1bdb9.pdf ). The sheet shows the wiring thus; I have...
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    H-Bridge design - is p-channel/pnp high-side switching advantageous?

    I am proposing to control a simple D.C. very low current (circa 50mA) motor with an H-Bridge controlled by four outputs from a 14M2 chip - no PWM, just on/off and direction. I want the whole thing rather compact and therefore I don't want to use half of an L293D, but just a simple H-Bridge with...
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    SPE035 Serial Audio Module

    Delighted to open an envelope this morning containing my order of the new SPE035 Serial Audio Modules - potentially a most useful addition to the PICAXE stable. One problem; the circuit board is marked R1 - 1K and the SPE035 document refers to R1 as being 1K. The module kit, however, contains...
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    Forum update somewhat overdue...

    Technical, Hippy, Anyone new to the PICAXE system may be a little unimpressed with the forum entitled "New Product Releases" and subtitled "Announcements of new product releases and software updates". This looks rather abandoned; is there a reason why this is stuck in a time-warp? This could...
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    SERTXD and displaying in binary on the console

    When debugging programs that switch eight bits of a port for control purposes, it can be most useful to SERTXD the value to display on the console in binary form. This allows immediate identification of which lines are high or low. For example; sertxd ( "controls="...
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    #Macros and #define - parameter passing

    I am not quite getting my head around the syntax for parameter passing into macros; I don't see why the following code is invalid; #picaxe 40x2 symbol controls=b0 #define redlight 1 #define greenlight 2 #define bluelight 3 #macro light_on (lightcolour) setbit controls,lightcolour...
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    Current limiting stepper motor driver using PICAXE DAC

    I am building a stepper motor driver that will be pulsed and direction-controlled by a PICAXE - probably a 40X2 given the other aspects of the system. The driver is quite straightforward and is based upon an L297 stepper driver and an L298 H-Bridge and works just fine. The L297/L298...
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    Driving a Size 23 Stepper Motor

    I have just acquired a size 23 Hybrid Stepper Motor (Astrosyn MY23HS2-2) and I want to drive it using a PICAXE. I have driven smaller motors successfully, but I would be grateful for a little advice to check that I am thinking along the right lines with this one... The motor is an eight lead...
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    PICAXE PIC programmer error

    I am trying to use my PICAXE PIC Programmer to program a blank PIC12F629. I fired up Programming Editor 5.5.6 and it recognises the Programmer is present and allows me to initiate the Wizard to convert Basic to Assembler. After selecting the appropriate parameters it then stops with a...
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    Optimising data comms using ERF,XRF and SRF devices

    Perhaps one directly for Technical, but all response appreciated. I am constructing a "personal area network" (PAN) using a combination of ERFs (PICAXE firmware) and XRFs and SRFs. All working most effectively within a short but reasonable distance. I am sending 6 byte packages through the...
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    Configuring ERF with Wizards and Ciseco Explorer Plus

    I am probably missing something really obvious...but after a day of hair-pulling I am asking for help, please. I am trying to configure an PICAXE ERF unit using the URF/SRF/XRF/ERF configuration wizard (v1.03) under PICAXE EDITOR 6.064. I am using a Ciseco B009 Explorer Plus to interface the...
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    Serin timeout and clock-speed

    Is the timeout period (stated in milliseconds) affected by the clock-speed in the manner of pause etc.? I have searched around the manuals etc. for the information but I cannot find it. If I use the form "serin [65535,noack], c.1,2400_8,b1,b2" will I get the same real time timeout as using...
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    L293D H-Bridge Driver - dual voltage supply question

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    OT: Calling all YOUNG GEEKS - Are you under 30?

    A recent thread asked what the average age of PICAXE forum users is - but it was entitled "Calling all old farts"... not exactly the way to get younger members to answer! Today in that thread, Dippy postulated about under 25s but perhaps 30 is a better definition of young today. So here we...
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    Decoupling on 40X2

    I note in Microchip's presentation on power considerations for PICs ( http://ww1.microchip.com/downloads/en/DeviceDoc/power.pdf ) that they advise that both Vdd power lines should be supplied externally - I know that this subject has been discussed before on this forum, but I also note that they...
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    Transceiver-linked 40X2s

    I would be most grateful for some guidance from the experienced forum experts with this project. I intend linking two PICAXE 40X2s via a serial link over XBee transceivers. My aim is to map PORT D as inputs on one unit to PORT B as outputs on the other. This arrangement to apply both ways...
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