Updated all my Photon devices last night to 2.2.0 from 2.1.0 and now all my DHT22 Sensors read 0 Degs and 6553% Humidity.
Tried changing to the libraries, tried Both Adafruit_DHT and Adafruit_DHT_Particle and same error.
All of my single DHT Photons no longer work.
However one of my Photons that’s connected to Several DHT22 Sensors DOES read a single one of them correctly. It’s connected to pin D1 and working. However all the other sensors connected to D4, D5, D7 all get the error described above.
Another photon connected to a single DHT22 is on Pin D5
They are all on my custom printed circuit boards (made 4 years ago and working till the update now) so I can’t easily experiment moving pins around.
I tried downgrading the FW back to 2.1.0 but apparently you can’t go backwards like that so no clue how to roll back.
Any help would be greatly appreciated as my entire sensor system is down now 
Here is my code on the system with multiple sensors
// This #include statement was automatically added by the Particle IDE.
#include <Adafruit_DHT_Particle.h>
#include <neopixel.h>
#include <elapsedMillis.h>
SYSTEM_MODE(SEMI_AUTOMATIC);
double FWVer = 1.58;
int FansOnTemp = 81; int FansOffTemp = 78; int CRLightLevel = 1; int FanSpeed = 255; int FirstBoot = 1;
int VentTempF; int VentHumid; int VentError; int OutsideTempF; int OutsideHumid; int OutsideError; int PCRunning;
int AtticTempF; int AtticHumid; int AtticError; int CRTempF; int CRHumid; int CRError; int FansRunning;
const byte RGBMaxBright = 200; int RedSet = 255; int GrnSet = 255; int BluSet = 255;
const byte VentConLed = A0; const byte AtticConLed = D3; const byte CRConLed = D0; const byte LedPin = D6; const byte PCBtn = A3;
const byte VentTempProbePin = D7; const byte OutsideTempProbePin = D5; const byte AtticTempProbePin = D4; const byte PCMon = A2;
const byte CRTempProbePin = D1; const byte FanControlPin = A5; const byte LightControlPin = A4; const byte MagSensorPin = D2;
const byte RedAbove = 80; const byte YellowAbove = 76; const byte GreenAbove = 63; const byte AquaAbove = 57; const byte BlueAbove = 36; // Sets Temps for What Colors Display at What Temp. Any Temp Below BlueAbove is Full RED and Full BLUE!
const int CheckSensorTime = 3000; const int PublishTime = 300000; const int FanTime = 300000;
const byte CLR = 12; const byte Line2 = 148; const byte Line1 = 128; const byte Note = 220; byte DisplayLCDScreen; // Vars for Making LCD Commands Eaiser
const byte ColorSpeed = 1; const int RGBCheckTime = 1000; const int LCDCheckTime = 5000; String AppString;
Adafruit_NeoPixel LED = Adafruit_NeoPixel(7, LedPin, WS2812B);
DHT VentTempProbe(VentTempProbePin, DHT22);
DHT OutsideTempProbe(OutsideTempProbePin, DHT22);
DHT AtticTempProbe(AtticTempProbePin, DHT22);
DHT CRTempProbe(CRTempProbePin, DHT22);
elapsedMillis TimerCheckSensors;
elapsedMillis TimerCheckPublish;
elapsedMillis TimerCheckFans;
elapsedMillis TimerCheckRGB;
elapsedMillis TimerCheckLCD;
void setup() {
Serial1.begin(9600); //Start Serial for LCD
LED.begin(); LED.show(); //Start WS2812B LEDs
Particle.function("PCPowerApp", PCPower);
Particle.variable("ContRoom", &AppString, STRING);
pinMode(VentConLed, OUTPUT); pinMode(AtticConLed, OUTPUT); pinMode(CRConLed, OUTPUT); //Set pin modes
pinMode(FanControlPin, OUTPUT); pinMode(LightControlPin, OUTPUT); //Set pin modes
pinMode(PCBtn,OUTPUT); pinMode(PCMon,INPUT_PULLDOWN);pinMode(MagSensorPin, INPUT_PULLUP); //Set pin modes
VentTempProbe.begin(); OutsideTempProbe.begin(); AtticTempProbe.begin(); CRTempProbe.begin(); //Startup the Sensor Probes
Serial1.write(22); Serial1.write(17); Serial1.write(CLR); delay(100); // Sets system to on with no cursor, Turn backlight on, Clear
Serial1.write("Welcome: Bovine"); Serial1.write(Line2); Serial1.write(" Control Room"); delay (3000);
Serial1.write(CLR); delay(10);
Serial1.write(" Connecting to:"); Serial1.write(Line2); Serial1.write("Particle Cloud..");
if (Particle.connected() == false) {Particle.connect();} delay(3000);
Serial1.write(CLR); delay(10); // Sets system to on with no cursor, Turn backlight on, Clear
Serial1.write(Line1); Serial1.print(" Control Room"); Serial1.write(Line2); Serial1.print(" FW Ver:" + String (FWVer,2)); delay(5000);
Serial1.write(CLR); delay(10); //Clear the screen
analogWrite(LightControlPin, 255); analogWrite(FanControlPin, 255); // Sets Control Room Lights & Fans to Full Power for Testing
for (int L=0; L<7; L++) {LED.setPixelColor(L,LED.Color(RGBMaxBright,RGBMaxBright,RGBMaxBright));}//Set LEDs to White for Testing
LED.show();
Serial1.write(Line2); Serial1.print(" Light Test");
Serial1.write(Line1); Serial1.print(" Fan Test"); delay(3000);
Serial1.write(Line1); Serial1.print(" Booting: System Check "); delay(1500);
Serial1.write(CLR); delay (100); Serial1.print("Reading Sensors"); delay(1500);
CheckSensors(); //Check each sensor for valid readings and report
if (VentError == 1) {Serial1.write(Note); Serial1.write(Line2); Serial1.print("Vent Snsr Fail"); delay(5000);}
if (AtticError == 1) {Serial1.write(Note); Serial1.write(Line2); Serial1.print("Attic Snsr Fail"); delay(5000);}
if (OutsideError == 1) {Serial1.write(Note); Serial1.write(Line2); Serial1.print("Outsde Snsr Fail"); delay(5000);}
if (CRError == 1) {Serial1.write(Note); Serial1.write(Line2); Serial1.print("CrtlRm Snsr Fail"); delay(5000);}
if (CRError == 0 && OutsideError == 0 && AtticError == 0 && VentError == 0){Serial1.write(Line2); Serial1.print("All Sensors OK!"); delay(3000);}
Serial1.write(CLR); delay(5); //Clear LCD Screen
analogWrite(LightControlPin, 0); analogWrite(FanControlPin, 0); //Shutoff the Fan and Light Test
Serial1.write("Booted and Ready");
Particle.publish("ControlRoom", "FW Ver:" + String (FWVer) + "Now Online",60,PRIVATE);
FirstBoot = 0; // First boot is now over, Set switch to reflect that
}
void loop() {
CheckSensors();
FanControl();
CheckRoomLights();
UpdateVentLED();
UpdateLCD();
UpdateAppString();
PublishUpdates();
if (Particle.connected() == false) {Particle.connect();}
}
void UpdateAppString(){
AppString = String(OutsideTempF) + "," + String(OutsideHumid) + "," + String(AtticTempF) + "," + String(AtticHumid) + "," + String(VentTempF) + "," + String(VentHumid) + "," + String(CRTempF) + "," + String(CRHumid) + "," + String(PCRunning) + ",X";
}
int PCPower(String CommandPC){
int PCReturns;
if (CommandPC == "PC On"){
if (digitalRead (PCMon) == LOW){
Serial1.write(Note); PCReturns = 2020;
Particle.publish("ControlRoom","Sending PC On",60,PRIVATE);
digitalWrite(PCBtn, HIGH); delay(500); digitalWrite(PCBtn, LOW);
}
else {Particle.publish("ControlRoom","PC Already On",60,PRIVATE);}
}
else if (CommandPC == "PC Off"){
if (digitalRead (PCMon) == HIGH){
Serial1.write(Note); delay(500); Serial1.write(Note); PCReturns = 2020;
Particle.publish("ControlRoom","Sending PC Off",60,PRIVATE);
digitalWrite(PCBtn, HIGH); delay(500); digitalWrite(PCBtn, LOW);
}
else {Particle.publish("ControlRoom","PC Already Off",60,PRIVATE);}
}
else if (CommandPC == "PC Off FORCE"){
if (digitalRead (PCMon) == HIGH){
Serial1.write(Note); delay(100); Serial1.write(Note); delay(100); Serial1.write(Note); PCReturns = 2020;
Particle.publish("ControlRoom","Sending PC FORCE Off",60,PRIVATE);
digitalWrite(PCBtn, HIGH); delay(6000); digitalWrite(PCBtn, LOW);
}
else {Particle.publish("ControlRoom","PC Already Off",60,PRIVATE);}
}
return PCReturns;
}
void UpdateLCD(){
if (TimerCheckLCD >= LCDCheckTime){TimerCheckLCD = 0; //If it's time to Update then reset timer and run update
Serial1.write(17); Serial1.write(22);// Turns Backlight on & cursor after disconnection/Reconnection
Serial1.write(CLR); delay(5); Serial1.write(Line1);
if (VentError == 0){Serial1.print("I"); Serial1.print(int(VentTempF)); Serial1.print(":"); Serial1.print(VentHumid); Serial1.print("% ");}
else {Serial1.print("I Error ");}
if (OutsideError == 0){Serial1.print("O"); Serial1.print(int(OutsideTempF)); Serial1.print(":"); Serial1.print(OutsideHumid); Serial1.print("%");}
else {Serial1.print("O Error");}
Serial1.write(Line2);
if (CRError == 0){Serial1.print("C"); Serial1.print(int(CRTempF)); Serial1.print(":"); Serial1.print(CRHumid); Serial1.print("% ");}
else {Serial1.print("C Error ");}
if (AtticError == 0){Serial1.print("A"); Serial1.print(int(AtticTempF)); Serial1.print(":"); Serial1.print(AtticHumid); Serial1.print("%");}
else {Serial1.print("A Error");}
}
}
void UpdateVentLED(){
if (TimerCheckRGB >= RGBCheckTime) {TimerCheckRGB = 0; //If it's time to Update then reset timer and run update
if (OutsideTempF >= RedAbove) {RedSet = RedSet + ColorSpeed; GrnSet = GrnSet - ColorSpeed; BluSet = BluSet - ColorSpeed;} // If Above RedAbove then start to change color to Red only
else if (OutsideTempF >= YellowAbove) {RedSet = RedSet + ColorSpeed; GrnSet = GrnSet + ColorSpeed; BluSet = BluSet - ColorSpeed;} // If Above YellowAbove then Add Green and Red
else if (OutsideTempF >= GreenAbove) {RedSet = RedSet - ColorSpeed; GrnSet = GrnSet + ColorSpeed; BluSet = BluSet - ColorSpeed;} // If Above GreenAbove then Change to only Green
else if (OutsideTempF >= AquaAbove) {RedSet = RedSet - ColorSpeed; GrnSet = GrnSet + ColorSpeed; BluSet = BluSet + ColorSpeed;} // If Above AquaAbove then change to Aqua (Blue and Green) Only
else if (OutsideTempF >= BlueAbove) {RedSet = RedSet - ColorSpeed; GrnSet = GrnSet - ColorSpeed; BluSet = BluSet + ColorSpeed;} // If Above BlueAbove then start to change to Blue Only
else if (OutsideTempF == 0) {RedSet = RedSet + ColorSpeed; GrnSet = GrnSet + ColorSpeed; BluSet = BluSet + ColorSpeed;} // If Sensor Error then go white
else {RedSet = RedSet + ColorSpeed; GrnSet = GrnSet - ColorSpeed; BluSet = BluSet + ColorSpeed;} // If Below BlueAbove then start to add full Red to full blue (Pink)
// If any color ends up being below 0 or above RGBMaxBright then correct it so no errors via outside allowable parameters (0-255)
if (RedSet < 0) {RedSet = 0;} if (RedSet > RGBMaxBright) {RedSet = RGBMaxBright;}
if (GrnSet < 0) {GrnSet = 0;} if (GrnSet > RGBMaxBright) {GrnSet = RGBMaxBright;}
if (BluSet < 0) {BluSet = 0;} if (BluSet > RGBMaxBright) {BluSet = RGBMaxBright;}
for (int L=0; L<7; L++) {LED.setPixelColor(L, LED.Color(RedSet,GrnSet,BluSet));} // Set LEDs to Correct Color
LED.show();
}
}
void CheckRoomLights(){ // If door sensor detects low then turn on CRLights OR High to turn lights off
if (digitalRead(MagSensorPin)==LOW){analogWrite(LightControlPin, CRLightLevel);}
else {analogWrite(LightControlPin, 0);}
}
void FanControl(){ //Fan Control Code via Temp
/* if (FansRunning == 0 && CRTempF >= FansOnTemp){
analogWrite(FanControlPin, FanSpeed);
FansRunning = 1;
TimerCheckFans = 0;
Particle.publish("ControlRoom","Fans ON:" + String (CRTempF) + "F",60,PRIVATE);
}
if (TimerCheckFans >= FanTime){
TimerCheckFans = 0;
if (CRError == 0 && FansRunning == 1 && CRTempF < FansOffTemp){
analogWrite(FanControlPin, 0);
FansRunning = 0;
Particle.publish("ControlRoom","Fans OFF:" + String (CRTempF) + "F",60,PRIVATE);
}
}
if (CRError == 1){analogWrite(FanControlPin, 255); FansRunning = 1;} // If Control Room Sensor is in Error then Enable Fans as Precaution
*/
}
void CheckSensors(){
if (TimerCheckSensors >= CheckSensorTime || FirstBoot == 1){TimerCheckSensors=0; //If it's time to Update then reset timer and run update OR skip timer if it's first boot
VentTempF = (VentTempProbe.getTempFarenheit() - 3);
VentHumid = VentTempProbe.getHumidity();
if (VentHumid==0){VentError = 1;}
else {VentError=0;}
digitalWrite(VentConLed, HIGH); delay(5); digitalWrite(VentConLed, LOW); delay(25);
if (VentError==0){digitalWrite(VentConLed, HIGH);}
OutsideTempF = (OutsideTempProbe.getTempFarenheit() - 1);
OutsideHumid = OutsideTempProbe.getHumidity();
if (OutsideHumid == 0){OutsideError = 1;}
else {OutsideError = 0;}
AtticTempF = AtticTempProbe.getTempFarenheit();
AtticHumid = AtticTempProbe.getHumidity();
if (AtticHumid == 0){AtticError = 1;}
else {AtticError = 0;}
digitalWrite(AtticConLed, HIGH);delay(5); digitalWrite(AtticConLed, LOW); delay(25);
if (OutsideError == 0 && AtticError == 0){digitalWrite(AtticConLed, HIGH);}
CRTempF = CRTempProbe.getTempFarenheit();
CRHumid = CRTempProbe.getHumidity();
if (CRHumid == 0){CRError = 1;}
else {CRError = 0;}
digitalWrite(CRConLed, HIGH);delay(5); digitalWrite(CRConLed, LOW); delay(25);
if (CRError == 0){digitalWrite(CRConLed, HIGH);}
}
if (digitalRead (PCMon) == HIGH){PCRunning = 1;} //Tracks PC Status and Updates Cloud Var
else {PCRunning = 0;}
}
void PublishUpdates(){ //Publish Sensors to Particle Feed (Mostly for WholeHouse Fan Speed Kickdown)
if (TimerCheckPublish >= PublishTime){TimerCheckPublish = 0;
if (VentError == 0){Particle.publish("CRHouseTemp", String (VentTempF), 60, PRIVATE);}
/* if (VentError == 0){
Particle.publish("ControlRoom","Vent Temp:" + String (VentTempF) + "F " + "Humid:" + String (VentHumid) + "%",60,PRIVATE);}
else {Particle.publish("ControlRoom","Vent Sensor Error",60,PRIVATE);}
if (OutsideError == 0){
Particle.publish("ControlRoom","Outside Temp:" + String (OutsideTempF) + "F " + "Humid:" + String (OutsideHumid) + "%",60,PRIVATE);}
else {Particle.publish("ControlRoom","Outside Sensor Error",60,PRIVATE);}
if (AtticError == 0){
Particle.publish("ControlRoom","Attic Temp:" + String (AtticTempF) + "F " + "Humid:" + String (AtticHumid) + "%",60,PRIVATE);}
else {Particle.publish("ControlRoom","Attic Sensor Error",60,PRIVATE);}
if (CRError == 0){
Particle.publish("ControlRoom","CRoom Temp:" + String (CRTempF) + "F " + "Humid:" + String (CRHumid) + "%",60,PRIVATE);}
else {Particle.publish("ControlRoom","Control Room Sensor Error",60,PRIVATE);}
*/
}
}
