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  1. neiltechspec

    Lipo charger - advice required

    Why not use a TP4056 based charger, upto 8v input and 1amp (adjustable) charge current. I have used quite a few of these for charging single LiPo cells, the last few I bought (ebay) had low voltage cut off built onto the small PCB. ebay item No 123089070772 as an example. Neil
  2. neiltechspec

    LCD Contrast Pin Current

    That's more or less what I thought. Haven't really got room for a pot & having one would mean having to dismantle the casing I'm fitting the LCD into. Think I'll give it a try. Neil. This is the LCD I'll be using.
  3. neiltechspec

    LCD Contrast Pin Current

    Voltage seems to be between 0v & 1v approx, depending on display. As per the title, does anybody have an idea of how much current the LCD contrast pin draws. I'm looking to drive it off the DAC pin, should be possible if very low current required I would have thought. Neil.
  4. neiltechspec

    Unusual LCD Display

    Has anybody successfully used one of these before, or has any idea what driver chip it uses ?. It's a 8 X 2 LCD display that seems to be numeric only (and a decimal point) Using RevEd AXE133 code, 254,1 clears the display ok 254,192 positions cursor to beginning of 2nd line But 254,128 is not...
  5. neiltechspec

    Neoway M590 GSM Texter

    Found a Neoway M590 GSM SMS Text Module on fleabay for £7.90. Came setup for 9600baud, uses TTL simple AT commands for comms & runs off 3.3v It's really easy to use, but suggest the datasheets are studied as well. #rem M590 GSM Texter 9600baud V1.0 Sept 2016 On Power Up module sends :-...
  6. neiltechspec

    difficulties connecting axe132 to displaytech 204a

    This is what I do with 20X4 LCD / OLED to stop the driver board sticking out beyond the end of the display. Upper display is LCD with backlight on C.2, by the addition of a transistor & SMT resistor. Lower display is OLED. Oops, no it isn't OLED, it's a blue LCD with permanently on back light...
  7. neiltechspec

    HSEROUT on an 08M2

    A quickie question on hserout. Noting this statement in Manual 2 - The hserout command is used to transmit serial data from the fixed hardware serial output pin of the microcontroller. It cannot be used with the serial download output pin - use the sertxd command in this case. With -...
  8. neiltechspec

    ADC10 Calculation

    Having a bit of trouble getting my head around the calculation need for a Oil Pressure Gauge. The sensor gives a linear o/p from 0 to 100 PSI. 0 psi = 0.5v 50 psi = 2.5v 100 psi = 4.5v Normally I would use - Supply Voltage 5v adcconfig 0 readadc10 w0 Then it would be easy to convert the...
  9. neiltechspec

    calibadc seems to screw up port C.7 on 20M2

    Title says it all really. I'm using a 20M2 driving two 7 seg Common anode displays directly through 470 ohm resistors to limit current to approx 5 mA per port. Units digit on port B & Tens digit on port C, so port C.7 has segment 'G' on my tens digit. Driving the ports low turns on the...
  10. neiltechspec

    TLC59116 Confusion

    Trying to get a TLC59116 - i2c LED PWM driver to work. I can't seem to understand the datasheet around device addressing. Trying the code below, but doesn't work :- hi2csetup i2cmaster,$c0,i2cslow,i2cbyte 'set base address hi2cout $d0,($00,$01) 'enable LED all call address & turn on OSC...
  11. neiltechspec

    Having Trouble with Fahrenheit Conversion

    Using a HT21D i2c Humidity & Temp sensor, no probs with Humidity & Temp in degrees C. But I can't seen to get my head around converting negative degrees C to degrees F. Any help appreciated, relevant part of code is below (with below 0 remmed out). Neil. symbol temp12 = w7 symbol adjtemp =...
  12. neiltechspec

    HTU21D Maths question

    I'm playing around with one of those HTU21DF sensors. Reading data ok & masking off the two status bits ok, but I'm having trouble trying to work out the maths for actual RH & actual Temp conversions for an M2 chip. Basically they are :- actualRH = -6 + (125.0 * rawRHData / 65536) &...
  13. neiltechspec

    RTC Clock Setter using GPS

    Many of my projects use RTC Clock Modules, either DS1307's or DS3231's. I got fed up with try to set the time from the PC and could only get within 3 or 4 secs, so came up with this today. Uses a ublox NEO-6 GPS Module PICAXE 28X2. Needs an X1 or X2 chip for the bit shifting capabilities...
  14. neiltechspec

    What's an M2 chips ADC input impedance ?

    As subject - What's an M2 chips ADC input impedance ? Does anybody have a quick answer. Neil
  15. neiltechspec

    ublox GPS

    Has anybody managed to alter the NMEA message config on one of these GPS modules. I only need GPRMC, but with no skipped fields - by default speed & course are skipped if not moving. I need the skipped fields to read 000.0 & 000.0 Neil
  16. neiltechspec

    AXE201 Datasheet ?

    Thinking of buying one of these, but there seems to be a problem with the datasheet. The link shows Manual 1 and not the details of AXE201. Does anybody have the correct datasheet (cct diagram) ?. Neil.
  17. neiltechspec

    The need for decoupling

    So, yet another problem has been resolved today by the addition of a decoupling capacitor. (Not me !). It's been seen so many times now. So why don't Rev Ed put the need for Decoupling Capacitors in big Red Letters at the start of all the manuals ??????. Seems an obvious omission to me. I...
  18. neiltechspec

    Internal Pullup Resistors

    Just a quickie question, had a quick search & can't seem to find anything. Does anybody know the value of the internal pullup resistors on M2 chips, and is is consistent across the same types ?. Neil.
  19. neiltechspec

    Weird AXE027 Behaviour

    Had something very weird happen this morning. Been working on a Li-Ion charger with a 08M2 doing the control & monitoring (the cheap Chinese one went up in smoke - no surprise there then). Finally completed it last night and left it charging a nearly flat 18650 cell and went to bed. Quite a few...
  20. neiltechspec

    Farenheight Conversion

    I'm having a bit of trouble trying to convert to to Fahrenheit & displaying to one decimal place. Currently using the following code which displays rounded value only. readtemp12 insens,temp12 ;read raw into temp12 if temp12 = 0 then ;check if DS18B20 responding pause 750 serout...
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