Timeline for How to connect RN-131 (wifi module) to RN-SRL-PRO3V-DGL (USB-to-TTLdongle)
Current License: CC BY-SA 3.0
5 events
| when toggle format | what | by | license | comment | |
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| Jun 13, 2012 at 3:04 | comment | added | David Norman | The baudrate on the wifi module is set by default (which is 9600bps, 8-data bits, 1-stop bit, no parity, hardware flow disabled. What if I loopback TX into RX would that damage the module? This would be to see whatever message I send from the source through wifi will be bounced back to the source? You reckon the module should be find if I do so? I contacted Roving about this, its been 3 days they haven't replied. | |
| Jun 13, 2012 at 2:19 | comment | added | Russell McMahon♦ | @DavidNorman - Sounds correct. WiFi module serial TX to dongle should be high when idle. Dongle TX to WiFi should be high when idle. Presumably you have set equal baud rates in some manner or they default to the same value? Voltage levels at both ends should be the same 5V and 3V3 are liable to sort of work maybe not. | |
| Jun 12, 2012 at 21:58 | comment | added | David Norman | Also I should point out, I wanted to check if the UART (TX-RX pins) are working fine on RN-131, So I used an oscilloscope to observe the TX pin only. When I send a string say for example "Hello World" I see the TX pin go 'low' while it receives data over wifi. As you might already know, whatever RN-131 receives over wifi is transmitted out its TX pin and whatever is received on its RX pin from UART is transmitted out wifi. You reckon this is a good way to test RN-131??? | |
| Jun 12, 2012 at 21:55 | comment | added | David Norman | wow that was really detailed, RN-131 TX pin is active low, so when idle (while its not receiving anything through wifi) the TX pin would be high (i.e. at 3.3V). Also I dont really get why the Voltage divider is necessary at SEN0. I had seen that earlier but I thought that was to wake the module up from sleep upon Receiving data. But I have noticed when I plug the dongle in my USB port (note, at this point the wifi module is also powered up), the voltage on TX pin of the dongle has a voltage drop of 0.72V, even when I send something through terminal emulator, 0.72V is stationary. | |
| Jun 12, 2012 at 13:02 | history | answered | Russell McMahon♦ | CC BY-SA 3.0 |