Figure 3 shows some examples. What else could you want? PICAXE products offer an attractive alternative to novices who lack experience using microprocessors and would like to learn more about them without a major investment in development tools and software training. Figure 1 lead photo shows details of the PCB assembly removed from a recently acquired AXE cable and its schematic. There are at least four major suppliers of these chips worldwide: For connections to the inverters, use tiny 30 gauge wire-wrap wire or strands from stranded hookup wire. Figure 4 shows how you can use discrete transistors and resistors for the inverters.

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The chips are inexpensive, and the editing software for writing and testing the program is a free download.

Building Your Own PICAXE Download Cable | Nuts & Volts Magazine

Figure 3 shows some examples. There are at least acble major suppliers of these chips worldwide: You can temporarily power your PICAXE circuit from the module, but for a final design use something that works when the download cable is unplugged. These canle available from many sources in China, Taiwan, and Hong Kong. Transistor inverters are inexpensive and parts are readily available. Learning Electronics Need to brush up on your electronics principles? Nearly all modules have one or more LEDs to indicate power, transmit, receive, etc.

Since most of the converter modules will operate up to Kb, you can use your cable for many computer interface projects other than PICAXE downloading. There is no standard pinout sequence.

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PICAXE USB Programming Cable (AXE027)

Output designations are followed by a symbol if they are active low by default. Any type of NPN transistors can be used, and the resistor values are not critical.

These multi-part series may be just what you need! To package the additional inverter circuitry, attach a small perfboard extension to the end of the module board with epoxy. In summary, there are ways that PICAXE could have made it difficult to substitute third-party download cables, but to their credit there is no evidence they have attempted to do that.

Figure 4 shows how you can use discrete transistors and resistors for the inverters. None of these boards have the capability of inverting RX and TX. Note that the 22K and 10K resistors from Figure 2 are still necessary to prevent noise on the serial input when the cable is disconnected.

PICAXE products offer an attractive alternative to novices who lack experience using microprocessors and would like to learn more about them without a major investment in development tools and software training. My favorite is the board at the far right of Figure pivaxewhich is supplied with a protective outer wrapper of clear heat shrink tubing. To test your completed cable — including the inverters — jumper pin 1 to pin 2, and then use Windows HyperTerminal or any other serial comm utility software to perform a loopback test.

The PCB is a bit of an overkill, with top, bottom, and intermediate ground plane layers.

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PICAXE USB Programming Cable (AXE) – Robot Gear Australia

Ample info and tips are available in forums and published manuals. After anchoring a three-conductor cable and testing the unit, cover the add-on board assembly with epoxy or heat shrink.

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axe02 Many hobbyists are reluctant to venture into new technology because of startup costs. Most other applications for a serial comm cable use standard TTL polarity signals, ppicaxe you won’t need the inverters.

There is one catch, though. The 22K and 10K resistors cannot be part of the cable. All you would need to add would be cables. That’s easily done in several ways. Purchasing a ready-made converter module or breakout board can save you the tedious job of soldering the small closely-spaced pins of a converter chip.

Select the miscellaneous parts per the version you are building. No other programming equipment is required.

Building Your Own PICAXE Download Cable

Download cable using a converter module that can us inverted RX and TX. The cable uses an FTRx series converter — a chip found in many USB-to-serial converters because of its versatility, as well as the availability of drivers for a wide variety of operating systems.

Need to brush up on your electronics principles?