Hi
I have a simple remote control circuit with RF module 433mhz and pt2262&pt2272-m4.
The outputs are four leds and they should turn on when i press the button(transmitter) but instead they blink. It doesnt matter the distance from the receiver and the transmitter they dont stop blink.
There is also a led that indicates the connection between the two circuits and it also blinks, and i dont think it is normal.
Thanks in advance!

Theo

 

Is this a complete module you purchased or a circuit you have assembled?
What powers the transmitter and receiver circuits?

 

i assembled the circuit: the resistor for oscilation in the pt2272-m4 is an 240k and the resistor in the pt2262 for oscilatijon is 1.2M. i also noticed that when i change the reisitor values the leds turn off or the blinking time changes to slower or faster.
the transmitter circuits is power by an power supply and the receiber is power by batteries, which the total is almost 5v. but i powered the receiver with the power supply and nothing changed

 

The specs show a 200K resistor for the PT2272 if the supply is between 3 and 15 volts. The 1.2M is listed for the PT2262.
So seems close enough.
Can you post your circuit exactly as it's wired?
Does it work if the output of the PT2262 is connected directly to the 2272?

 

i tested the module with an arduino and it didnt work, the problem is problably in the module i will order another.
hopefully these modules are very cheap.

 

i tested the module with an arduino and it didnt work, the problem is problably in the module i will order another.
hopefully these modules are very cheap.

Are you speaking of the RF modules?
Have you verified that the PT chips are OK as I suggested by connecting them directly to each other?

 

yes the RF modules seems to be the problem, i tested the pt chips connecting them directlly to each other and it works fine.
thank you for your help!

 

The reason that the LEDs are blinking is that you are using the PT2272- M4 decoder which is momentary. The PT2272-L4 is the latching version.
The encoder (PT2262) scans the inputs and transmits their status in serial format. The momentary decoder (M4) will only activate the corresponding output channel briefly. The latching decoder (L4) latches each output until new data is received.
There is nothing wrong with what you have. You just picked the wrong one. See the data sheet:
PT2272 pdf, PT2272 Description, PT2272 Datasheet, PT2272 view ::: ALLDATASHEET :::

 

According to the TS the chips work when connected directly.
Momentary means the output is steady as long as a transmission is in progress. Should not blink.

 

According to the TS the chips work when connected directly.
Momentary means the output is steady as long as a transmission is in progress. Should not blink.

See the above data sheet. It states " PT 2272 is available in several options to suit every application need : variable number of data output pins, latch
or momentary output type."

The inputs are scanned and transmitted as a serial data stream. Momentary means that the output on each channel is only active while receiving data for that channel. Each output will blink once for each scan of inputs. Latched means that the output stays in the last state received until it is updated by the next data scan.

 

Each output will blink once for each scan of inputs.

As long as a button is held down the LED is steady ON.
I don't see any blinking.