How to use the mcp-spi-adc.openMcp3208 function in mcp-spi-adc
To help you get started, we’ve selected a few mcp-spi-adc examples, based on popular ways it is used in public projects.
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node-red / node-red-nodes / hardware / mcp3008 / pimcp3008.js View on Github 
this.dev = n.dev || "3008";
var node = this;
var cb = function (err) { if (err) { node.error("Error: "+err); } };
var opt = { speedHz:20000, deviceNumber:node.dnum, busNumber:node.bus };
var chans = parseInt(this.dev.substr(3));
try {
fs.statSync("/dev/spidev"+node.bus+"."+node.dnum);
if (mcp3xxx.length === 0) {
for (var i=0; i= 0) && (pay < chans)) { pin = pay; }
else { node.warn("Payload needs to select channel 0 to "+(chans-1)); }
}
else { pin = parseInt(node.pin); }
if (pin !== null) {
mcp3xxx[pin].read(function (err, reading) {
if (err) { node.warn("Read error: "+err); }
else { node.send({payload:reading.rawValue, topic:"adc/"+pin}); }
});mcp-spi-adc
MCP3002/4/8, MCP3202/4/8 and MCP3304 SPI analog to digital conversion
