The Tilt Hydrometer is a nice easy way to get real-time information about the specific gravity and temperature of beer that you're brewing.
It broadcasts information about your brew to your Phone through Bluetooth LE, however if you are brewing in Stainless Steel containers or in a garage then you might have problems getting a high enough signal strength to put your phone somewhere convenient.
Just upload the code below to any Bluetooth LE capable Espruino board, and put the board within range of the Tilt. It'll scan for the reading from the Tilt and will then broadcast it at a higher signal strength, increasing the range.
Save on send
set to Direct to flash
in the Web IDE settings when uploading💡This code can be uploaded in a few clicks with the Espruino App loader
function arrayBufferToHex (arrayBuffer){
return (new Uint8Array(arrayBuffer)).slice().map(x=>(256+x).toString(16).substr(-2)).join("");
}
function startScan (){
NRF.setScan(function(d) {
var hexData = arrayBufferToHex(d.manufacturerData);
if (hexData.substr(8,4) == 'bb' + color + '0'){//matches key portion of iBeacon UUID for a Tilt
changeInterval(tiltInterval, 980); //after finding a Tilt, scan for the next advertisement in 980ms. (assumes a 20ms processing time)
digitalPulse(LED2, 1, 3);//flash green LED to indicate a connection
NRF.setScan();//stop scanning since tilt has been found
//console.log(hexData);
var majorValue = parseInt(hexData.substr(36,4),16);//set values to repeat
var minorValue = parseInt(hexData.substr(40,4),16);//set values to repeat
var uuidValue = parseInt(color + hexData[11], 16);//convert tilt color to hex value for use in UUID
//console.log(majorValue, minorValue, uuidValue);
NRF.setAdvertising(require("ble_ibeacon").get({ uuid : [0xa4, 0x95, 0xbb, uuidValue, 0xc5, 0xb1, 0x4b, 0x44, 0xb5, 0x12, 0x13, 0x70, 0xf0, 0x2d, 0x74, 0xde], major : majorValue, minor : minorValue, rssi : -59 }),{interval:1000});
scanCounter = 0;
}
}, { filters: [{ manufacturerData: { 0x004C: {} } }] });
//try to sync
if (scanCounter == 1){
changeInterval(tiltInterval, 1000);//change to 1 second interval after initial interval of 980ms (assumes 20ms processing time no longer needed)
}
//fast search if not found in sync
if (scanCounter == 120){//starting scanning 4x more frequently if tilt not found after 120 tries
changeInterval(tiltInterval, 190);
scanCounter = 2;//skips changing scan to 1 second interval, keeps scanning 4x
}
scanCounter++;
//console.log(scanCounter);
//stop scan after x ms
setTimeout(function () { NRF.setScan(); }, 110);//main function to duty cycle scanning, scan is actually only 10ms, assumes 100ms for scanning to start up
}
// fix for powersave issue in 2v01 and earlier
digitalWrite(D7,0);
//enable watchdog timer - disabling because when asleep it causes a reboot
//E.enableWatchdog(5);
// set power
NRF.setTxPower(4);
// intialize global variables
var scanCounter = 0;//number of scans counted starts from 0
var color = 0;//no tilt color selected state
var presses = 9;//not advertising state
var tiltInterval;//global variable for managing tilt scan frequency
// remove all watches
clearWatch();
//cleart intervals and timeouts
clearInterval();
clearTimeout();
setWatch(function() {
presses++;
//conditional for presses past valid color (8)
if (presses == 9){//turns off advertising and scanning, flashed red LED to indicate turned off
NRF.sleep();
clearInterval(tiltInterval);
digitalPulse(LED1, 1, 50);
return;
}
if (presses > 9){
presses = 1;//start over with presses (color)
NRF.wake();
tiltInterval = setInterval(function (){ startScan(); }, 190);//start with frequent scan
digitalPulse(LED2, 1, 50);
}else if (presses < 9) {
digitalPulse(LED2, 1, 50);
}
//jump to fast search
scanCounter = 120;//skip to 120 to maintain frequent scanning
var uuidValue = parseInt('0x' + presses + '0');
//start advertising initial repeated color whith zeros for sg and temp values
NRF.setAdvertising(require("ble_ibeacon").get({ uuid : [0xa4, 0x95, 0xbb, uuidValue, 0xc5, 0xb1, 0x4b, 0x44, 0xb5, 0x12, 0x13, 0x70, 0xf0, 0x2d, 0x74, 0xde], major : 0, minor : 0, rssi : -59 }),{interval:500});
color = presses;
}, BTN, { repeat: true, debounce : 50, edge: "rising" });
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