In spite of my preference for more sophisticated wireless approaches, Chinese firm Dorji have just sent me some new 433 MHz Amplitude Shift Keying (ASK) data modules to evaluate. You'd think this entry end of the market would have been quite done to death by now,BUT bravely Dorji have rustled up new modules that (it transpires) may just cut the mustard for simple needs.
We'll no doubt see, but compared with other offerings these are not only cheap (~US$5-$10 a matched pair) but are compact,dead easy to use, have a much more powerful (but legal)TX, significantly more sensitive RX, µA level snooze capable and are supply voltage tolerant.As every 6dB gain doubles range I estimate maybe up to an order of magnitude range boost over regular 433 MHz cheapies may result. Links of perhaps a km could be feasible, and a trio of AA cells may be good for near shelf life on the receiver when suitably PICAXE controlled. Australian PICAXE outlet MicroZed intends handling them down under (along with Dorji's regular GFSK transceiver & swish new mesh networking & sensor modules).
A glaring data blunder has been revealed however. Unless St.Pat's Day mischief is at work with my vision,then it seems that the Dorji web site & .pdf images for these new modules are shown mirror imaged! Rest easy lads-the Irish in me has risen to the challenge & I've now flipped them correctly. Refer the attached for these and a feature summary. Module testing to follow. Stan.
We'll no doubt see, but compared with other offerings these are not only cheap (~US$5-$10 a matched pair) but are compact,dead easy to use, have a much more powerful (but legal)TX, significantly more sensitive RX, µA level snooze capable and are supply voltage tolerant.As every 6dB gain doubles range I estimate maybe up to an order of magnitude range boost over regular 433 MHz cheapies may result. Links of perhaps a km could be feasible, and a trio of AA cells may be good for near shelf life on the receiver when suitably PICAXE controlled. Australian PICAXE outlet MicroZed intends handling them down under (along with Dorji's regular GFSK transceiver & swish new mesh networking & sensor modules).
A glaring data blunder has been revealed however. Unless St.Pat's Day mischief is at work with my vision,then it seems that the Dorji web site & .pdf images for these new modules are shown mirror imaged! Rest easy lads-the Irish in me has risen to the challenge & I've now flipped them correctly. Refer the attached for these and a feature summary. Module testing to follow. Stan.
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