Search found 7 matches

by clinkme
Sat Jun 18, 2011 7:21 am
Forum: Shields, boards and sensors
Topic: Serial Bluetooth RF Transceiver Module RS232
Replies: 154
Views: 123473

Re: Serial Bluetooth RF Transceiver Module RS232

Hi clinkme, miniquad was faster... 10 Ohms is OK, iirc I used 33 Ohms, but just because I had this one at home. TX is not critical as you drive the 5V input of the AVR with only 3.3V from the BT modul. The resistor in this line is just an additional safety for current limiting. Regards, gompf Thank...
by clinkme
Thu Jun 16, 2011 2:38 pm
Forum: Shields, boards and sensors
Topic: Serial Bluetooth RF Transceiver Module RS232
Replies: 154
Views: 123473

Re: Serial Bluetooth RF Transceiver Module RS232

Hi Clinkme, You can check the schematic at m and find out how to use voltage divider using resistors on the rx pin to make it tolarent to 5v driven MCUs. For more details about voltage dividers, you can visit the wiki page at m Thank you very much for your reply. I need only TX pin (one way communi...
by clinkme
Wed Jun 15, 2011 7:13 pm
Forum: Shields, boards and sensors
Topic: Serial Bluetooth RF Transceiver Module RS232
Replies: 154
Views: 123473

Re: Serial Bluetooth RF Transceiver Module RS232

Yes, I would say so. As you can see from the schematics, the "5V base plate" only carries a voltage regulator circuite+status LED. The RX/TX lines are pure 3.3v and RX still needs a resistor divider to accept 5V. NP on TX as the AVR accepts 3,3V as H, buts as you just found out the 5V H f...
by clinkme
Wed Jun 15, 2011 5:23 pm
Forum: Shields, boards and sensors
Topic: Serial Bluetooth RF Transceiver Module RS232
Replies: 154
Views: 123473

Re: Serial Bluetooth RF Transceiver Module RS232

Yes, I would say so. As you can see from the schematics, the "5V base plate" only carries a voltage regulator circuite+status LED. The RX/TX lines are pure 3.3v and RX still needs a resistor divider to accept 5V. NP on TX as the AVR accepts 3,3V as H, buts as you just found out the 5V H f...
by clinkme
Wed Jun 15, 2011 4:50 pm
Forum: Shields, boards and sensors
Topic: Serial Bluetooth RF Transceiver Module RS232
Replies: 154
Views: 123473

Re: Serial Bluetooth RF Transceiver Module RS232

Yes, I would say so. As you can see from the schematics, the "5V base plate" only carries a voltage regulator circuite+status LED. The RX/TX lines are pure 3.3v and RX still needs a resistor divider to accept 5V. NP on TX as the AVR accepts 3,3V as H, buts as you just found out the 5V H f...
by clinkme
Wed Jun 15, 2011 3:45 pm
Forum: Shields, boards and sensors
Topic: Serial Bluetooth RF Transceiver Module RS232
Replies: 154
Views: 123473

Re: Serial Bluetooth RF Transceiver Module RS232

Yes, I would say so. As you can see from the schematics, the "5V base plate" only carries a voltage regulator circuite+status LED. The RX/TX lines are pure 3.3v and RX still needs a resistor divider to accept 5V. NP on TX as the AVR accepts 3,3V as H, buts as you just found out the 5V H f...
by clinkme
Wed Jun 15, 2011 3:38 pm
Forum: Shields, boards and sensors
Topic: Serial Bluetooth RF Transceiver Module RS232
Replies: 154
Views: 123473

Re: Serial Bluetooth RF Transceiver Module RS232

Yes, I would say so. As you can see from the schematics, the "5V base plate" only carries a voltage regulator circuite+status LED. The RX/TX lines are pure 3.3v and RX still needs a resistor divider to accept 5V. NP on TX as the AVR accepts 3,3V as H, buts as you just found out the 5V H f...