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    Picaxe 75% Off Sale at Robot Mesh

    The transistor appears to be marked as "S5" and might be one of these Link
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    Hacking RS-232 communications between my Altair 8800 and a PC app

    One of those cheap 8 channel logic analyzers might be a good solution. With either Sigrock Or Saleae software the serial data can be decoded and analyzed rather easily. Both supports both Inverted and True data polarity at just about any baud rate. I prefer the Saleae software Ver 1.2.29...
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    variables for time

    Hi, Attached is code that demonstrates how EnableTime /Time can be used on M2 Parts to Increment a Variable every 10 minutes without using pauses. Code has been tested on silicon and is accurate to +- 1 sec over 10 minutes( or better). Assumes operation at 4 MHz but can be easily adjusted to...
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    variables for time

    Which Picaxe do you intend to use? The chip you use will likely determine the method.
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    Picaxe chips supplied in there original pic form and without picaxe program

    My question is where did these 12F508 chips come from?. Were they ordered directly from Rev-Ed or from elsewhere? If ordered directly from Rev-Ed and the invoice shows (7) 08M2 chips on the invoice, and NO NKM2401 chips, then Rev-Ed should replace them. It could be 'possible' that...
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    40X2 Pulsout not working correctly

    @hippy If this is indeed a firmware bug, it may be prudent to also test the 28X2 for a similar issue. Probably nothing but won't hurt to test.
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    40X2 Pulsout not working correctly

    Picaxe firmware "remaps" these pins, meaning that the Picaxe defined PORTA is not the PIC Hardware PORTA. It is rather a software defined Port. So Picaxe A.6 and A.7 are actually on PIC hardwear PortE. What you are seeing could be a glitch in the firmware, but I would think that would...
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    40X2 Pulsout not working correctly

    Is the display connected when you test with the above code? Try with it disconnected. I would also use a scope instead of the logic analyzer to see the actual voltage levels on the pin. Maybe try (temporarily) moving RS to pin on PORTC and see what happens. My guess is that this is not...
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    Optocoupler for PC PSU's 5V line to Picaxe input pin?

    Personally, I would not bother with an OPTO in this case. A 10K or even 22K series resistor combined with the PIC's internal ESD diodes should be more than adequate to protect the Picaxe input.
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    HV series PIC

    @julianE Please check you private messages Goey
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    28X2 to drive a Rev-Ed 4x20 OLED to tell the time with a DS3231

    You may be able to operate the 40X2 @ 32Mhz without a crystal/resonator. Setting the PLL bit in the OSCTUNE register should multiply the default 8 MHz by 4, giving 32 MHz For the 40X2 the code would be: PokeSFR $9B, %01000000 Whether or not this will work depends upon if Rev-ed has forbidden...
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    HV series PIC

    JulianE, You should go to GCB help forum and report your Issue and findings as they need to know all of this.
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    HV series PIC

    Try adding #config CLKOUTEN = ON Then scope RA4 (Pin3) for a 4MHz clockout signal. If no signal then the HFINTOSC is not operating or has stopped. If the signal is in the 7KHz range then the micro is operating at 31Khz.
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    HV series PIC

    So where is the actual issue? Under what conditions? Are you using a shunt resistor, If so what value ? What Voltage is applied to the shunt resistor? What value is the bypass cap? Are you supplying 5V directly to the VDD pin with no shunt ( 0 ohm)? What value Bypass Cap ? Also this chip...
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    HV series PIC

    You should be able to rather easily program this chip to blink an LED (and much more) using one of the many BASIC compilers out there. You will probably need a Pickit2/3 for programming. I have never had any issues with any PIC doing such a simple task as blinking an LED using GCB or others...
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    "Servopos" Command : servo jerks! :((

    When using the servo/servpos commands, jerkiness/Jitter is likely due to to background tasks such as periodic checking of of the supply voltage for brownout detection and periodic checking for a download. These can be stopped by using 'disablebod' and 'disconnect'. Also per Manual2 the...
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    Temperature + Humidity Measurement with DHT11 Sensor and 08M2

    Nice workaround for a really cheap but somewhat dodgy sensor. When I was building high end egg incubators I tried both DHT-11 and DHT-22 sensors (AM2302). Testing showed the variance between individual sensors to be as high as 10% RH. This was with the temperature at 35.5 C stable to within...
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    Measuring elapsed time

    Which Picaxe Chip? (Not all Picaxe chips are created equal). With either a 20x2 or 28x2 you should be able to use 'settimer' and 'setintflags' to generate an interrupt every 500ms
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    28X2 to drive a Rev-Ed 4x20 OLED to tell the time with a DS3231

    Looking at the supplied code, at initialization C.0,C.1 & C.2 (Q1,Q2, & Q3) are floating. Nowhere in the code are these pin set as outputs. Suggest these pins be set as outputs (Low) at the start of the initalization process. You may want to retain the pulldown resistors to prevent a glitch...
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    analog adc reading resolutions of any picaxe

    If 2.0V is the max input voltage then you can use the 2.048V internal reference (FVR). With READADC10 the resolution will be 2 mV. With READADC it .will be 8 mV. With careful attention to grounding and component values you should be able to get an accuracy of +- 2 LSB. To return an output...