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I have bought TSOP39438 IR Receiver. I have use your test method with LED and resistor and it works. Now I need to decode it with PIC microcontroller and here's next problem.
When I measure the Vout with multimeter,
When no IR light detected, Vout around 4.0 ~ 4.12 V
When IR light detected...
Thanks. Now I can understand fully what the problem in my code. Without infinite loop, the program will end. I will remember this mistake. Thanks again.
I use the timer overflow flag as interrupt, and that's how it get interrupt every few usec without main loop. Anyway, I believe it is the read-modify-write problem. I make shadow copy of GPIO to continuously update the output pin. Now it was working in simulation. However, the switch case is...
I am having problem with switch case. The program look like this:
unsigned char state;
void main()
{
state = 1;
}
static void interrupt isr()
{
if(T0IF)
{
T0IF = 0;
TMR0 = -40;
switch(state)
{
case 1: GPIO2 = ~GPIO2;
state = 2;
break;
case 2: GPIO1 = ~GPIO1...
I cannot get the result from simulation.:sad:
At TX side, I make an signal w/o carrier frequency for simulation.
TX program to generate pulse:
At RX side, I use USART with baud rate specified as around 3221 bps. I dunno what is going wrong, could be the logic or program is wrong...
I found a really cheap microcontroller to replace the 555 timer part of circuit, which is PIC10F202, I have PICKit2 programmer, but I couldn't find the programmer circuit to interface with the PIC. Pls help.
Sry I made a mistake in circuit...The output of 555 timer now look fine. However, after pass through resistor and BJT, it gives a very weird voltage wave output.
I use Multisim.
Normal output from 55 timer.
Abnormal output from IR LED.
Let say selected modulating frequency is 400Hz...
Thanks for your quick reply.
I found this schematic in following website, which I feel is suitable
Infrared alarm barrier
However, TSOP18 series of infrared receiver in their schematic is discontinued. So, is there other common type I can use?
Can you show me the formula to calculate the...
By reduce the detection range, reflection from wall should also be reduced. So, I believe the main problem now is that the IR is transmitted concurrently, which mean they should have different bit pattern, like 11000001 for the first IR transmitter.
Hi. I'm not sure if this is the right section but here's the problem I faced.
I am building a robot that will be guided to 3 different locations using infrared. What I'm planning to do is to have IR transmitter in each location to transmit modulated signal to the robot. My problem is how to...
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