Be careful to choose the 433MHz version for ULRS, follow the links above to get to the correct products.<\/p>\n The TX module is a regular OrangeRX 1W TX module with two differences :<\/p>\n Photos provided by Wayno<\/a> :<\/p>\n This module can be programmed via ICSP with an arduino programmer such as USBasp.<\/p>\n This module can be programmed via FTDI.<\/p>\n It’s mandatory to configure ULRS CC to flash these modules as if they were ‘Wolfbox’ modules<\/strong>.\u00a0The difference is in the baudrate used to flash them, other than that the pinout is similar to OrangeRX modules.<\/p>\n The TX module doesn’t have a DTR pin, you’ll have to solder a DTR pin before connecting the FTDI cable. The board already has a hole for this pin, and the required capacitor.<\/p>\n The TX has the same switching regulator module as the OrangeRX, and does accept up to 36V.<\/p>\n The RX module is also based on RFM23BP (1W module) and is powered at 5V by a switching regulator.<\/p>\n It can be flashed through the 6 pins ICSP port, this is confirmed to work<\/a> :<\/p>\n Alternatively, this adapter from HK<\/a> should work :<\/p>\n This modules doesn’t have a bootloader and requires an USBasp programmer or similar, for programming.<\/p>\n However once a bootloader is programmed, you can then with some hardware modifications use also an FTDI cable.<\/p>\n The two following mods are mandatory to use ULRS with the RX module :<\/p>\n The RX module has a design issue that makes it unreliable : its microcontroller is powered at 5V and directly connected to the RFM chip, which only accepts 3.6V. This creates unstability.<\/p>\n There are two ways to lower the microcontroller voltage to 3.6V :<\/p>\n On this modules the RSSI and PPM pins are inverted, this mod<\/a> will correct it (mod proposed by RICKY24<\/a>)<\/p>\n The wiring of this board is slightly different from the regular OrangeRX module. Here the PPM signal is found on the RSSI pin.<\/p>\n You can still obtain the RSSI by selecting RSSI as PWM in ULRS CC, so it will be sent as an RC channel or use the hardware mod described above.<\/p>\n The RX uses a XL1530 switching regulator, which accepts up to 18V .<\/p>\n![\"\"](\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2017\/08\/86182_3.jpg\")
<\/a>I didn’t test them yet, but rcgroups user Wayno Complaino<\/a>\u00a0had good results and shared them in the ULRS rcgroup thread<\/a>.<\/p>\nTX Module<\/h2>\n
\n
![\"\"](\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2017\/08\/image003.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2017\/08\/image002.jpg\")
<\/a><\/p>\nProgramming via ICSP (USBasp)<\/h3>\n
Programming via FTDI (ULRS CC)<\/h3>\n
Baudrate<\/h4>\n
DTR pin<\/h4>\n
![\"\"](\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2017\/08\/add-a-dtr-pin.png\")
<\/a><\/p>\nPower supply<\/h3>\n
RX Module<\/h2>\n
Warnings<\/strong><\/h3>\n
\n
\n
Description<\/h3>\n
![\"\"](\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2017\/08\/image004.jpg\")
<\/a>![\"\"](\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2017\/08\/image005.jpg\")
<\/a><\/p>\nProgramming via ICSP (USBasp)<\/h3>\n
![\"\"](\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2017\/08\/FR9HXLZGAPV8IA4.MEDIUM1.jpg\")
<\/a><\/p>\n![\"\"](\"https:\/\/www.itluxembourg.lu\/site\/wp-content\/uploads\/2018\/01\/27195-3.jpg\")
<\/a><\/p>\nProgramming via FTDI (ULRS CC)<\/h3>\n
Mandatory mods<\/h3>\n
Reduce the microcontroller voltage<\/h4>\n
\n
Reverse the PPM and RSSI pins<\/h4>\n
Remark about the RX PPM pinout<\/h3>\n
Power supply<\/h3>\n
Results<\/h2>\n