​ ​ ​ ​ Project Activity Poll - Page 3

View Poll Results: Are you doing anything interesting with PICAXE?

Voters
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  • No

    4 18.18%
  • Yes! (Describe in a post below.)

    18 81.82%
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Thread: Project Activity Poll

  1. #21
    Member
    Join Date
    Jan 1970
    Location
    Romsey, Hampshire, UK
    Posts
    56

    Default

    My projects are mainly ham radio related. Currently completing an automatic antenna tuning unit using on a 28X2 to go with a low power CW transceiver for the 20 metre ham band. Also a frequency counter for the same transceiver using another 28X2 and which sends the operating frequency (using ICOM IC-7000 protocol) to the logging program running on a laptop.

    The ham radio transceiver that I completed a year ago used seven PICAXEs to control various functions.

    Finally I will probably have to make another timer (using an 08M2) for the local gliding club. This timer turns off the ground and air band transceivers in vehicles used on the airfield when the ignition has been off for 1 hour. This ensures batteries are not run down because the driver forgot to turn the radios off when he put the vehicles away.

    Richard

  2. #22
    Senior Member
    Join Date
    Feb 2010
    Location
    Don't Mess With My Texas!
    Posts
    2,560
    Blog Entries
    7

    Thumbs up

    Whoa, this is all I knew about "LaTeX" ...
    Latex is a stable dispersion of polymer microparticles in an aqueous medium.
    ... before now! Good show! Now I looked up something new. Most projects need better documentation than we give them.

    Controls, alarms, aids for the elderly (ME! ). These are all great stuff for PICAXE projects.

    There must be more! Please vote, too.
    - Tex
    __________________________________________________ _______________________
    These words are my opinion, WYLION. Any resemblance to truth or fiction is accidental at best.
    "Truth lies dormant in our future history." ― Tex Clodhopper LXVI
    "Confidence is ignorance. If you're feeling cocky, it's because there's something you don't know." ― Eoin Colfer, Artemis Fowl

  3. #23

    Default

    First project was an automatic level crossing for a passenger carrying miniature railway.
    A number of varied remote control systems for model (battery powered) locomotives. Some using keyfob radio Tx, some with IR control.
    An automated Thomas the Tank Engine to run back & forth unattended.
    Current trials include a (miniature railway) Picaxe interlocking and control of signals via LoRa. Also a token/tablet/train staff type system using ibuttons.
    Future plans include GPS based train control & a "cruise control" for model steam locomotive (I guess similar to Circuit's project in a previous post above?).

    Definitely fun, just need some time to play!!

  4. #24
    Senior Member
    Join Date
    Feb 2012
    Location
    London
    Posts
    2,872

    Default

    Hi,

    There's certainly still plenty on my "ToDo" list. The PICaxe capabilities which particularly interest me are its small size and very low power consumption. Typical applications are for 24/7 "environmental" sensing (e.g. weather conditions), generally connected wirelessly and using only battery-power, or charged by very modest solar panels (e.g. cannibalised from solar garden lights).

    For construction, I now often design my layouts to fit in the space of a single AA cell ! It avoids the need to devise a custom "enclosure" since the module fits directly inside the battery box, or even the battery compartment of existing equipment. In particular, an "AA PICaxe" plus a single LiFePO4 AA cell (3.2 volts) can fit in the 2 x AA battery compartment of many off-the-shelf devices.

    These can be built without recourse to SMD components or even a custom PCB. A piece of Veroboard (stripboard) or "perfboard", 6 holes wide by 19 - 20 holes long is the size of an AA cell, providing the outer two tracks are slightly pared down to an overall 14 mm width. Typically, the edge tracks provide supply and ground rails, whilst the 08M2 sits in the middle of the board. Of course some track cuts and links are needed, with components standing mainly vertically, but these can be easily documented by the updated (2016) version of PEBBLE (v3.1e).

    In addition to the 08M2 it's possible to fit on "dummy" battery terminals at the ends of the board and a standard PICaxe programming socket, but the "Legacy" Molex-style connector pins are more versatile and can save board space. I've fitted various other components to these boards, for example a buzzer/sounder (e.g. for low battery warning) or an RJ12 socket (common for weather station sensors) or even a second 8-pin DIL socket for an I2C EEPROM, or as a "GPIO header". Thus one of my projects still to formally document is an "AA data logger" which fits inside an AA battery compartment and can monitor/log the voltage (CALIBADCxx), current drain (through the dummy battery contacts) and temperature (CHIPTEMP) etc., for a considerable period.

    Another fun project is "A weather station in an 08M2" (or two 08M2s if a wireless-link is required). Wind Speed and Rain can use simple pulse counters, with Temperature, Humidity and Barometric pressure sensors, etc. on the I2C bus (the BME280 does all these in one tiny package). Also, solar light level, charging and control can be performed with a single PV panel and one PICaxe pin. However, there are several contenders to measure wind direction; I've previously trialled both the "Rotorvane" devised by Derek Weston, and the "Ultrasonic time of Flight" method. The Rotorvane appeals because, in principle, it can measure Wind Speed and Direction on just one PICaxe (digital input) pin.

    In addition to the above, I still have plans to "finish" my code snippets for CHIPTEMP (improved READINTERNALTEMP routine) and the BME280 (humidity sensing). Also, a Sun Position calculator (to complement the Sunrise/Sunset program) and an "08M2-powered AXE133" (to drive the LCD/OLED displays which already have an I2C "backpack" fitted). Not to mention the "Lithium AA cell on wheels" line-follower (using dual acceleration-controlled miniature steppers), and several other projects.

    Cheers, Alan.

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