Recent content by fernando_g

  1. fernando_g

    Investigating low power consumption modes.

    Of course, this is a *very preliminary study*, which can be significantly enhanced with all the variables mentioned in the posts above. But on the other hand, my intention is not to write a full blown datasheet...;) AllyCat's comment I had already noticed....while increasing the clock speed to...
  2. fernando_g

    Investigating low power consumption modes.

    I will be working on a project running from supercaps in the near future, and was looking at ways to minimize current consumption, for obvious reasons. I will write about this project later. Right now, I investigated the 14M2's current draw vs frequency, and in the sleep and disablebod modes. I...
  3. fernando_g

    Measuring small voltages with 20x2

    Very interesting thread a tour of force which shows clever ways to achieve surprising results with the limited integer arithmetic. Having said this, and on the practical side; nowadays that all Picaxe chips support I2C, I tend to use external ADCs instead whenever high accuracy is required...
  4. fernando_g

    AXE027 alternate

    Thanks for the prompt reply. You plan to tackle hand-soldering a QFN? (y)
  5. fernando_g

    AXE027 alternate

    @mortifyu: Which FTDI chip did you use? The FT230X appears to be suitable. I also own a proper AXE027 cable, and purchase all chips and accesories from legit RevEd distributors. But in many instances (a datalogger for instance) it is useful to have your PICAXE project connected via USB to a...
  6. fernando_g

    Interesting LED dimmer circuit

    Indeed, this whole circuit could be replaced with a single Picaxe 8M2, a pot and some resistors, driving a logic level Mosfet. Or if you want to drive a larger Mosfet, a suitable low-side gate driver, which are dime a dozen.
  7. fernando_g

    Solar panels for battery backup with trickle charge

    Like almost everything on Ebay, I would strongly suggest that you validate that the module does do what you want it to do. That includes maximum load operation at your operating temperature extremes. Lastly, if you plan to use it outside, do give it a pair of coats of humiseal. Mask the outside...
  8. fernando_g

    Porting from original 20M software to a 20X or 20M2

    Looong time, I've posted in this forum. My PICAXE basic is somewhat rusted, so this may be a very simple question to some of you. What is required to port original 20M software to a modern 20X or 20M2? I've an old project which I accidentally damaged the 20M. I already have a 20X which could...
  9. fernando_g

    OT: World's largest battery in Australia

    I would love to hear comments from our down under friends about the following news: http://www.dw.com/en/tesla-launches-worlds-biggest-battery-in-australia/a-41613121 I had read a Silicon Chip editorial page where it had been complained the SA's government had relied way too much on renewables...
  10. fernando_g

    the dreaded W10 update has happened!

    And Paint is gone! I know, I know.............now we have Paint 3D. Call me a Luddite, but I liked Paint. Why could they not both coexist?
  11. fernando_g

    Programming a 3V3-powered PICAXE with an AXE027

    I am planning to build a Picaxe system which will be powered from a 3V3 supply. But like all my projects, I would like to maintain software upgrade capabilities. However, the AXE027 is a 5V-only device. I was planning to include a resistive divider for Serial In pin, and a Mosfet level...
  12. fernando_g

    Cable Tester

    A cable tester may be as simple or as complicated as one wishes to do it. The attached image ONLY shows the switching matrix of a commercial cable tester. There is a similar size and complexity board for the logic controls.
  13. fernando_g

    practice soldering SMD?

    The problem with age and SMT components, is that as our vision becomes weaker, the components become smaller. And with them, their solder joints. Many people have suggested a good, lighted magnifying glass. I would also suggest an USB microscope. Look for instance, this solder bridge, which...
  14. fernando_g

    Der sinnlose Zähler: a Picaxe powered, Dekatron and Nixie display, do-nothing box

    The circuit: The core is a 20M generating random numbers, and then using those numbers to advance or decrease the count. To assist in the randomness, the AC waveform is sampled via the ADC10 command, and its value is used as a "seed" in the random variable. The Nixies operate from 170VDC, and...
  15. fernando_g

    Der sinnlose Zähler: a Picaxe powered, Dekatron and Nixie display, do-nothing box

    I had several pieces of the puzzle lying around: -a pair of Picaxe 20M, whose limited program length is no match for its I/O -a pair of Z560 German Nixies and some NOS Soviet 74151 Nixie drivers. -a pair of Soviet OG4 dekatrons -time on my hands. I had already purchased a Dekatron spinner kit...
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