Recent content by Mad Professor

  1. M

    Help needed understanding I2C related info in datasheet

    Good day all. I am soon to be starting a new project, and I am looking for some help and advice before I get in to deep. I have a 36v e-bike, and the battery pack has a ApolloGroup LT-013SF BMS, and this is based on the 02Micro OZ890 chip. The 02Micro OZ890 chip has an i2c interface where...
  2. M

    Need help choosing right op-amp for shunt resistor

    Good day all. As per the title I am looking for help chossing the right op-amp for a shunt resistor. I have never used op-amps before, so op-amps are very new to me, and I don't know alot about them. I am looking to monitor & log the current on my microcontroller. The current load is...
  3. M

    Battery cell charger / capacity tester

    Good day all. I am looking at designing and building a picaxe based battery cell charger / capacity tester. I have a bunch of 2.00volt wet cell nicad's, and 3.7volt lipo cell's. For the charging side I would wish to charge the cells with the constant current then constant voltage (CC/CV)...
  4. M

    Can you do Multi-Master i2c with picaxe?

    Good day all. As per the title I would like to know if it is possible to do Multi-Master i2c with picaxe chips? I have been doing some projects with master and slave i2c, but I would like to do Multi-Master i2c if possible. Thanks for your time. Best Regards.
  5. M

    non-picaxe related: opto-isolated serial interface cable

    Good day all. I hope you don't mind me posting a non-picaxe related question. I am trying to design and build a serial interface cable to connect my PC or laptop to a control board. The control board in question has 6pins on the serial connection. Pin1 - (RxD Positive). Pin2 - (RxD...
  6. M

    children's electric bike controller.

    Good day all. I am looking at starting a new picaxe project. Last summer I brought some electric quad bikes for my children, and the kids loved them. But the quad bikes just use a simple on/off switch to drive the motor. So over the winter I have been thinking about making a controller to...
  7. M

    Router speed controller

    Good day all. I have Power Performance FMTC1020R Router, that I would like to control the speed of via picaxe and or computer. The router does have a built in speed controller that I am looking to adapt to suit what I need. 1st off let me just say I have a very healthy respect for mains...
  8. M

    i2c RTC LCD Countdown Timer

    Good Day All. This will be my 1st project that uses any i2c based units. As of yet I don't have any of the hardware but it has been ordered. 1x AXE012X2 1x AXE033B 1x AXE034 The rest of the parts I can pick up locally. I have spent the best part of the day searching the forum, so I would...
  9. M

    DipTrace now has it's own forum

    Good Day All. As I know many of the PicAxe members use DipTrace, I thought I would let you know that DipTrace now at long last has there own forum up and running. http://www.diptrace.com/forum/ This went live on the 14/June/2010, so we no longer need to use the painful yahoo groups. Best...
  10. M

    SMD version of the FRM010 Serial LCD Firmware

    Good Day All. Can anyone tell me if there is an SMD version of the FRM010 Serial LCD Firmware chip? My current project is very limited on space so I am trying to use only SMD parts. I did try e-mailing techsupplies but the e-mail bounced back. Thanks for your time. Best Regards.
  11. M

    08M - Reseting

    Good Day All. A few of you having been helping me with my current project. The 08M is very easy to upset and reset. I can make the 08M reset evey time by just getting a pice of wire not connected to anything and tapping one end of the wire on the SW2 input on my PCB. If I do the same to...
  12. M

    08M - Serial Out / OUT0 Question.

    Good Day All. I have a quick question regarding the picaxe 08M chip. I know that pin7, is the Serial Out / OUT0 port. But I would like to know if I was to use an LED on this port, would I have any problems programming or running debug with the LED still connected, I know that the...
  13. M

    24Volt Adjustable Time Delay Circuit Needed

    Good Day All. I think this might be over kill for a pic, as I am sure a timer like the 555 would be able to do what I am after, but it's been well over 10 years since I last used 555 chips. I have posted over on allaboutcircuits. I am trying to build a power shutdown circuit for a friend...
  14. M

    ADC user input in Simulation

    Good Day All. In simulation how can I manual input more then once ADC value? I know I can use the Generic arrors or input a value, but this gives me the same value on all the ADC inputs. I can also click on the byte or word and enter a value, but when the next cycle of the program...
  15. M

    Picaxe based Volt/Amp Meter

    Good Day All. I would like your thoughts and suggestions before I start my next project. I will try and explain the basics of what I want to do. My old man is very into green engey find solar and wind. He now wants to be able to monitor in close to real time the voltage and current...
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