Hey all i am an absolute complete novice of all this just wondering if any one can help me out
im using a Arduino nano
Q1 Is it possibile to have a photocell move a servo in one hit (see light moves to positon no light moves back) instead of reading the amount of light and moving accordingly
Q2 Is it also possibile for a digispark attiny85 to do the same knowing i need different coding
Q1 Is it possibile to have a photocell move a servo in one hit (see light moves to positon no light moves back) instead of reading the amount of light and moving accordingly
Don’t get what you are asking there? What behavior do you actually want?
Q1: Yes, but... The photocell is going to give you an analog value, but there's no reason you can't react to that in a digital way. If the value is greater than some number then do something else do something else. Usually you add a little hysteresis so that when it is right on the line it doesn't flicker back and forth. But you do have to pick a number to divide the light from the dark. How dark is dark? It's never truly dark.
Q2: Absolutely. The code really isn't going to change much at all.
Commercial PIR modules have a built in comparator and potentiometer to define the triggering threshold and they also have a potentiometer for duration, which is a way to deal with hysteresis - most design are open source so you can read about that on line
Delta_G:
Q1: Yes, but... The photocell is going to give you an analog value, but there's no reason you can't react to that in a digital way. If the value is greater than some number then do something else do something else. Usually you add a little hysteresis so that when it is right on the line it doesn't flicker back and forth. But you do have to pick a number to divide the light from the dark. How dark is dark? It's never truly dark.
Q2: Absolutely. The code really isn't going to change much at all.
Ok i gave it a crack and honestly i have no idea what im doing. i looked up using analog values but couldnt find anything that would help all ive been doing is copy and paste then mucking around with the codes ive also tried putting a servo stop command in to with no luck. As for the digispark the code i used but just changed it to doesnt work
#include <SimpleServo.h>
SimpleServo servo;
int photocellPin = 0;
int servoPin = 1;
int pos = 0;
void setup()
{
servo.attach(1);
}
void loop()
{
Serial.print("Cell = ");
Serial.println(analogRead(photocellPin));
pos = analogRead(photocellPin);
pos = constrain(pos, 220, 740);
int servoPos = map(pos, 220, 740, 255, 0);
int servoDegree = map(servoPos, 255, 0, 45, 0);
servo.write(servoDegree);
Serial.print("Servo Degree = ");
Serial.println(servoDegree);
} [code]
any help would be super appreciative
You are missing a Serial.begin(115200); in the setup() for your prints to work (console at 115200 of course)
You don’t want to attach the servo to pin #1, it’s the serial communication. Don’t use 0 nor 1 on the digital side. Better use A0 to be very clear this is the analog input and not the digital input for the photocell. Confirm you indeed connected to A0 and not D0
The pins are constant, so define them with [color=green]const byte[/color] photocellPin = A0; for example
You should have a delay to wait for the time it takes for your servo to physically move. It’s not instantaneous and your code will spin hundreds of time per seconds
pos does no need to be a global variable since it’s only used in the loop(), remove clutter and define it there
You read the analog value twice. If you want to print it, read it first into a variable and print that variable and then use the variable to do the math to decide what angle should be used for the servo
The way this is coded is that the angle will be proportional to the lighting - is that what you wanted? Or did you want either full “close” or full “open” based on a light threshold?
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digispark attiny85 not connected at all to the arduino. I found a code online for the arduino and moded it for my needs did u read the entire posts or just skip to the bottom
digispark attiny85 not connected at all to the arduino. I found a code online for the arduino and moded it for my needs did u read the entire posts or just skip to the bottom
I read the last post. It contained some code that clearly has NOTHING to do the problem. Why did you post that code?
? Did u read all post or just last one not sure what you’re getting at I posted that because that’s were im at i was working with one code for 2 different boards an arduino nano and the digispark ive worked out the nano but still the digi I’m having trouble with please read through post as u will understand i have not much of a clue what im really doing as I’ve been mucking around with these for just over 2weeks and its just for 1 project
Thanks
No need to be a smart arse mate thats the code in working on for the digispark READ back thoroughly to get a understanding of where im at after weeks before getting the 2 arduinos I googled alot before joining this fourm just for some help
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