I uploaded a pic of my voltage divider. Im trying to use pieces of code from other projects and i think that is most of my issue. One of my professors did a project that had a piece of this that I wanted to use but is different from what I need and the other stuff that I have been testing comes from the other “monitor a 12V battery” on the getting started forum.
This is my professors project, I’m wanting to use the batterycheck he has implemented towards the end
/*This sketch experiments with low power for battery/solar operation and thingspeak.
to transmit a notification to your device when the mail is received. (mailbox door opened)
a magnetic reed switch is connected to D0. The particle sleeps and wakes on a falling edge interrupt at D0.
if triggered it publishes a notification that can be detected by IFTTT and sends a notification
to your device.
on every interrupt and on wakeup a update is published to thingspeak with voltage, RSSI and # of triggers.
+-----+
* +----------| USB |----------+
* | +-----+ * |
* /------------------| [ ] VIN 3V3 [ ] |
* | | [ ] GND RST [ ] |
* 10K | [ ] TX VBAT [ ] |
* | | [ ] RX [S] [R] GND [*] |-------
* | | [ ] WKP D7 [ ] | \
* \ | [ ] DAC +-------+ D6 [ ] | |
* /------batt sense->| [*] A5 | * | D5 [ ] | |
* 10K batt sense gnd ->| [*] A4 |Photon | D4 [ ] | 10K pull down to ground
* | [ ] A3 | | D3 [ ] | |
* | [ ] A2 +-------+ D2 [ ] | |
* | [ ] A1 D1 [ ] | |
* | [ ] A0 D0 [*] |<-magnetic reed (door) switch
* | |
* \ [] [______] /
* \_______________________/
*
*
*/
/* begin particle webhook code snippit to add to particle webhook interface on console
{
"event": "thingSpeakWrite_",
"url": "https://api.thingspeak.com/update",
"requestType": "POST",
"form": {
"api_key": "{{k}}",
"field1": "{{1}}",
"field2": "{{2}}",
"field3": "{{3}}",
"field4": "{{4}}",
"field5": "{{5}}",
"field6": "{{6}}",
"field7": "{{7}}",
"field8": "{{8}}",
"lat": "{{a}}",
"long": "{{o}}",
"elevation": "{{e}}",
"status": "{{s}}"
},
"mydevices": true,
"noDefaults": true
}
*/
char publishString[40];
int mailpin = D0;
int volttestpin = A5;
int voltpowerpin = A4;
const int sleepytime = 1800; //seconds to sleep 3600=1hr
const String key = "YOUR_THINGSPEAK_KEY_HERE";
int rssival = 0;
volatile bool mailsend = FALSE;
volatile bool rssisend = FALSE;
int mailtriggers = 0;
long waketime = 0;
SYSTEM_THREAD(ENABLED); //enable multitasking. allows the ability to catch the mailpin trigger and send the message
SYSTEM_MODE(AUTOMATIC); //run code. then connect
void rssi_update()
{
//delay (2000);
static int count = 0;
Serial.println(count++);
rssival = WiFi.RSSI();
sprintf(publishString,"%d",rssival);
bool success = Particle.publish("RSSI",publishString);
sprintf(publishString, "%1.4f", checkbattery());
Particle.publish("thingSpeakWrite_All", "{ \"1\": \"" + String(rssival) + "\"," +
"\"2\": \"" + String(checkbattery()) + "\"," +
"\"3\": \"" + String(mailtriggers) + "\"," +
//"\"4\": \"" + String(var3) + "\"," +
//"\"5\": \"" + String(var4) + "\"," +
"\"k\": \"" + key + "\" }", 60, PRIVATE);
if (success == TRUE) {
//delay(10000);
rssisend = FALSE; //if sent, then turn of the send flag, otherwise let it try again.
}
}
void enablemailsend(void){
mailsend=TRUE;
digitalWrite(D7,1);
}
void setup() {
//setADCSampleTime(ADC_SampleTime_239Cycles5); //sets adc to longest time for low noise
Time.zone(-4); //set eastern time zone
pinMode(mailpin,INPUT);
pinMode(voltpowerpin, INPUT);
pinMode(D7, OUTPUT);
attachInterrupt(mailpin, enablemailsend, FALLING);
Particle.variable("mailtrig", mailtriggers);
rssisend = TRUE;
}
void loop() {
if ((Particle.connected())&&(mailsend == TRUE)&&WiFi.ready())
{
mailnotification();
}
if ((Particle.connected())&&(rssisend == TRUE)&&WiFi.ready())
{
rssi_update();
}
if ((millis()-waketime > 20000) && (mailsend == FALSE) && (rssisend == FALSE))
{
Particle.disconnect();
//System.sleep(mailpin,RISING,30);
System.sleep(mailpin,FALLING,sleepytime);
pinMode(mailpin,INPUT); // this may need resetting after sleep.
waketime = millis(); //millis haults when sleeping. find out the time on boot and compare from there.
rssisend = TRUE; //on wakeup report rssi but do not report mail trigger
mailsend = FALSE;
}
if (digitalRead(mailpin) == LOW) {
enablemailsend();
}
if (Particle.connected() == false)
{
Particle.connect();
}
/*if (waitFor(Particle.connected, 20000))
{
}
*/
}
float checkbattery(){
float battvolts;
pinMode(volttestpin, INPUT);
pinMode(voltpowerpin, OUTPUT); //sent power pin as output
digitalWrite(voltpowerpin, 0); //send a 0, or LOW to turn on voltage test
delay(1); //wait for volts to settle good measure
battvolts = analogRead(volttestpin); //sample voltage
battvolts = float(battvolts)*3.3/4096.0*2.0*3.85/3.827; //calibrate voltage reading
pinMode(voltpowerpin, INPUT); //disable powerpin and set as high Z input
return(battvolts); //return calibrated battery voltage
}
void mailnotification(void){
digitalWrite(D7,1);
rssi_update();
sprintf(publishString, "%1.4f", checkbattery());
Particle.publish("mail/volts", publishString,60,PRIVATE);
//sprintf(publishString, "%d", mailtriggers);
bool success = Particle.publish("youve-got-mail", Time.format(Time.now(), "%I:%M%p"), 60, PRIVATE);
delay(1000);
if (success == TRUE) {
mailtriggers++;
mailsend = FALSE; //if sent, then turn off the send flag, otherwise let it try again.
digitalWrite(D7,0);
}
}
