Hello,
I am trying to make a laser "harp" using the teensy by reading some LDR's that have a laser pointed at them. To start I just did the bare bones tutorial #4 reading A0 to check the hardware before carrying on to code(10k ldr in series with 10k resistor dividing 3.3v). Everything worked great, then I copy pasta eight more inputs and everything goes ok but every other read is 0.More specifically A0-A8 read correctly once then on the next sweep they all display 0 then normal then 0 and so on. I tried playing with delays, increasing them, adding them between each read, removing them, etc. same behavior each way. I would be glad for any help as I have never needed to read so many inputs and I certainly have never seen this issue before.
The readings are working and I checked the circuitry it is working if I just use a 3.3v supply and use a meter to check the values.
Here is the code as it is now:
I am trying to make a laser "harp" using the teensy by reading some LDR's that have a laser pointed at them. To start I just did the bare bones tutorial #4 reading A0 to check the hardware before carrying on to code(10k ldr in series with 10k resistor dividing 3.3v). Everything worked great, then I copy pasta eight more inputs and everything goes ok but every other read is 0.More specifically A0-A8 read correctly once then on the next sweep they all display 0 then normal then 0 and so on. I tried playing with delays, increasing them, adding them between each read, removing them, etc. same behavior each way. I would be glad for any help as I have never needed to read so many inputs and I certainly have never seen this issue before.
The readings are working and I checked the circuitry it is working if I just use a 3.3v supply and use a meter to check the values.
Here is the code as it is now:
Code:
/* Analog Input Example, Teensyduino Tutorial #4
http://www.pjrc.com/teensy/tutorial4.html
After uploading this to your board, use Serial Monitor
to view the message. When Serial is selected from the
Tools > USB Type menu, the correct serial port must be
selected from the Tools > Serial Port AFTER Teensy is
running this code. Teensy only becomes a serial device
while this code is running! For non-Serial types,
the Serial port is emulated, so no port needs to be
selected.
This example code is in the public domain.
*/
void setup()
{
Serial.begin(38400);
}
int val[8];
void loop()
{
val[0] = analogRead(0);
val[1] = analogRead(1);
val[2] = analogRead(2);
val[3] = analogRead(3);
val[4] = analogRead(4);
val[5] = analogRead(5);
val[6] = analogRead(6);
val[7] = analogRead(7);
val[8] = analogRead(8);
Serial.print("Analog 0 is: ");
Serial.println(val[0]);
//delay(25);
Serial.print("Analog 1 is: ");
Serial.println(val[1]);
//delay(25);
Serial.print("Analog 2 is: ");
Serial.println(val[2]);
//delay(25);
Serial.print("Analog 3 is: ");
Serial.println(val[3]);
//delay(25);
Serial.print("Analog 4 is: ");
Serial.println(val[4]);
//delay(25);
Serial.print("Analog 5 is: ");
Serial.println(val[5]);
//delay(25);
Serial.print("Analog 6 is: ");
Serial.println(val[6]);
//delay(25);
Serial.print("Analog 7 is: ");
Serial.println(val[7]);
//delay(25);
Serial.print("Analog 8 is: ");
Serial.println(val[8]);
//delay(25);
delay(1000);
}