Wireless Module Serial UART I cant Enter AT- Command mode

Projects Networking, Protocols, and Devices
1

Hey All
i have a problem that i have been searching and trying hard to solve
i am trying to connect this module Wireless Module Serial UART (200M Range-433
Mhz) to my Arduino uno

Guide
http://www.fut-electronics.com/wp-content/plugins/fe_downloads/Uploads/Wireless-Serial-UART-Arduino.pdf
i connected everything right but every time i try to write a command in Hyper terminal or tera term i get nothing
and i am trying to connect to at command mode i get no result also
The module have 5 pins :
1: Power, 3.3 V to 5 V. (this pin is marked by white square)
2: Gnd.
3: RX (TTL)
4: TX (TTL)
5: PIN5 is the AT Control mode, Pull up to high or NC will make module
work as normal, When connect to low, it will enter the AT Command mode.
( High level enter AT mode) .
i use this USB TO TTL converter :
http://store.fut-electronics.com/PAE001.html

Thanks in advance for your help .

2

1: Power, 3.3 V to 5 V. (this pin is marked by white square)

Why? Maybe you should connect it to 120V AC.

5: PIN5 is the AT Control mode, Pull up to high or NC will make module
work as normal, When connect to low, it will enter the AT Command mode.

So, did you?

3

Yes i did here is a code for the pull up i used:
void setup() {
pinMode(inputPin, INPUT);
digitalWrite(inputPin,HIGH); // turn on internal pull-up on the inputPin
}

4

Turning on the internal pullup resistor of an INPUT pin and pulling an OUTPUT pin up to 3.3V are NOT the same thing. You did the former. The device expects you to do the latter.

5

Thanks for your replay PaulS
so i connect the set pin to arduino as an input and enable the internal pull-up resistor for example : pinMode(2, INPUT_PULLUP);
and the other pins as normal 5v and rx tx right?

6

5: PIN5 is the AT Control mode, Pull up to high or NC will make module
work as normal, When connect to low, it will enter the AT Command mode.
( High level enter AT mode) .

From this I cannot decide if the pin needs pulling to GND or to VCC.

7

so i connect the set pin to arduino as an input and enable the internal pull-up resistor for example : pinMode(2, INPUT_PULLUP);

No!!! Make the pin an OUTPUT and turn it on.

8

just did that still nothing on terminal .

9

Karimhes:
just did that still nothing on terminal .

How have you dealt with the fact that applying 5V to a 3.3V device just might have burnt it out?

10

It appears (I could be wrong) that pulling the AT control pin HIGH or leaving it disconnected will set the device operation to normal. To enter the AT command mode you must pull that pin LOW, do your AT command stuff, then go back to HIGH on that pin to return to normal operation.

void setup() {
   pinMode(inputPin, OUTPUT);
  digitalWrite(inputPin,LOW);  // enter AT command mode
// do your AT command stuff here, then
  digitalWrite(inputPin,HIGH);  // exit AT command mode
}
11

I could be wrong

No! Say it can't be so. 8)

12

PaulS:

I could be wrong

No! Say it can't be so. 8)

I was wrong once. I thought my answer was incorrect, but it wasn't. LOL :smiley: