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<\/a><\/p>\nWe use the famous ESP8266\u00a0 for this\u00a0 and work in the even more famous Arduino environment.\u00a0 The ESP8266 comes in many flavors but a convenient form factor is the NodeMCU board<\/a>.\u00a0 You can buy it on Aliexpress<\/a> or Ebay<\/a> at a low-cost (USD 2.2).<\/p>\n There is also a baseboard available for the NodeMCU and I use it as it is convenient when working with a new design. It to is available on Aliexpress<\/a> and Ebay<\/a> at a low-cost (USD 1.54).<\/p>\n The last item you need is the PIR sensor, they to are available at low-cost. I bought mine from Ebay<\/a> (USD 0.99).<\/p>\n If you haven’t set up your Arduino IDE for work with the ESP8266 you need to do that now.\u00a0 Here is an excellent tutorial<\/a> on how to do this. Make the blink example work before you move on.<\/p>\n I find the Arduino IDE a bit crude to work with so I use Visual Studio Code<\/a> instead.\u00a0 An excellent programming editor that works on all the major operation systems. I tend to use it more and more. But there are other options to such as Atom<\/a>. Anyway instructions on how to get it working for Arduino development is here<\/a>.\u00a0 Make sure to set the “output” tag to a valid location in the .vscode\/arduino.json file otherwise upload will be VERY slow.<\/p>\n You also need a VSCP daemon\/server running for this example. All info about it is here<\/a>.<\/p>\n To connect the sensor to the NodeMCU we need to know about he port mapping for the module which is a bit different from for other Arduino devices. It looks like this<\/p>\n D0 has a blue LED connected to it so it is an obvious candidate for status. D1 can be used to connect to the PIR<\/p>\n The PIR device I have outputs a 3V signal even when powered with +5V so it is OK to connect directly to D1. So the three pins on the PIR<\/p>\n The LED on D0 light up when a LOW is written to it. This is opposite to the PIR output. We take care of this in software.<\/p>\n We implement a dump VSCP device here. This is a device that does not handle any of the register reads that “normal” VSCP requires and which don’t have a MDF file either. A dumb device has bit 14 set in the header.<\/p>\n We send two events. The heartbeat event (CLASS1.INFORMATION, Type=9<\/a>) every minute. This event is recommended for all nodes as it is used for node discovery and detection. The other event we send is the detect event (CLASS1.INFORMATION, Type=49 detect<\/a>) when an object is detected.<\/p>\n The test setup looks like this<\/p>\n and you can find the complete code is here<\/a><\/p>\n The heartbeat coming into the VSCP daemon (using VSCP works)<\/p>\n and the detect event<\/p>\n<\/a><\/p>\n<\/a><\/p>\nstatic<\/span> const<\/span> uint8_t<\/span> D0 =<\/span> 16<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D1 =<\/span> 5<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D2 =<\/span> 4<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D3 =<\/span> 0<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D4 =<\/span> 2<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D5 =<\/span> 14<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D6 =<\/span> 12<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D7 =<\/span> 13<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D8 =<\/span> 15<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D9 =<\/span> 3<\/span>;<\/span>\nstatic<\/span> const<\/span> uint8_t<\/span> D10 =<\/span> 1<\/span>;<\/span><\/pre>\n1\u00a0\u00a0\u00a0\u00a0 +5V\n2\u00a0\u00a0\u00a0\u00a0 Output to D1 (High on detect)\n3\u00a0\u00a0\u00a0\u00a0 GND<\/pre>\n
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