For the others, you can add a couple of simple inverters. 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. Figure 4 shows how you can use discrete transistors and resistors for the inverters. There are at least four major suppliers of these chips worldwide: All you would need to add would be cables. Output designations are followed by a symbol if they are active low by default.
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AXE USB Cable Driver – Software – PICAXE
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. These are available from many sources in China, Taiwan, and Hong Kong. Most other applications for a serial comm cable use standard TTL polarity signals, so you won’t need the inverters. 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.
PICAXE USB Download Cable
What else could you want? My favorite is the board at the far right of Figure 3which is supplied with a protective outer wrapper of clear heat shrink tubing. After anchoring a three-conductor cable and testing the unit, cover the add-on board assembly with epoxy or heat shrink.
That’s easily done in several ways.
Building Your Own PICAXE Download Cable | Nuts & Volts Magazine
The 22K and 10K resistors cannot be part of the cable. 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. Figure 4 shows how you can use discrete transistors and resistors for the inverters.
The chips are inexpensive, and the editing software for writing and testing the program is a free download.
None of these boards have the capability of inverting RX and TX. Figure 3 shows some examples. No other programming equipment is required. It’s also a little clunky. Need to brush up on your electronics principles?
You can buy a postage stamp-sized MCP breakout board direct from the manufacturer Microchip or from major electronics suppliers Digi-Key, Mouser, Newark, Farnell, etc. Output designations are followed by a symbol if they are active low by default.
Nearly all modules have one or more LEDs to indicate power, transmit, receive, etc. To package the additional inverter circuitry, attach a small perfboard extension to the end of the module board with epoxy. For the others, you can add a couple of simple inverters.
PICAXE products offer an attractive alternative to novices who lack experience using microprocessors and would like to learn more about them without a major cavle in development tools and software training. Learning Electronics Need to brush up on your electronics principles? Select the miscellaneous parts per the version you are building. Ample info and tips are available in forums and published manuals. There are at least four major suppliers of these chips worldwide: There is one catch, though.
Transistor inverters are inexpensive and parts are readily available. They keep the PICAXE serial input from floating around like an antenna when the download cable is disconnected, which could result in noise pickup that might interfere with program execution.
There are many choices of similar ICs in a pin DIP package with through-hole leads, and many hobbyists sxe027 this cab,e of package because it is easy to work with when using perfboard or a solderless breadboard.
FTDI-based boards use a built-in oscillator, so no external crystal is needed. Many hobbyists are reluctant to venture into new technology because of startup costs. There is no standard pinout sequence. Download cable using a converter module that can provide inverted RX and TX.
For connections to the inverters, use tiny 30 gauge wire-wrap wire or strands from stranded hookup wire.