Update README.md

Author: AxxAxx

README.md

@@ -88,7 +88,10 @@ Programming or updating the firmware the STM32 MCU is done by using a SWD progra
 ![AxxSolder_SWD_programming](./photos/AxxSolder_SWD_programming.png)
 
 # First start up after build
-The first start up after you have built your AxxSolder can be intense. Double check all solder connections under a loupe/microscope. Especially the OPA2333, LTC4440 and the STM32G431 are small packages with tight pad spacing and can have solder bridges. Do also double check the connections to the soldering iron/stand which are shown in this document under [AxxSolder Station](#axxsolder-station) and [AxxSolder Portable](#axxsolder-portable). The first thing to do after you have double-checked everything is to follow the steps under [Firmware update](#firmware-update). It is wise to do the first programming of AxxSolder without any handle piece and with only 3.3 V or 5 V power input, not VDD. After the programming is done you can now power up AxxSolder again via either with 3.3 V or 5 V, this time you can attach your handle. This allows you to test that your handle type is detected correctly (the detected handle type T210/T245 is shown in the display). The sleep feature can also be tested by touching the stand (STAND Input). If the handle is detected correctly, the sleep function works and the display works you proceed to test the 5V DC/DC. This is done by once again disconnect the handle, but this time apply current limited 9-24 V VDD. 100 mA at 24 V is enough to check that the display starts and that you can measure the 3 bus voltages; 3.3V, 5V and VDD. If the the bus voltages looks good and the display shows the main screen you are ready to apply full VDD power and attach the soldering handle. If you are not 110% sure about your soldering/connections it is wise to be on the safe side and keep your soldering tip in a waterbath in over to prevent it from over-heating in an uncontrolled manner. During the development this method was used and saved a few of thoese expensive JBC cartridges..
+The first start up after you have built your AxxSolder can be intense. Double check all solder connections under a loupe/microscope. Especially the OPA2333, LTC4440 and the STM32G431 are small packages with tight pad spacing and can have solder bridges. Do also double check the connections to the soldering iron/stand which are shown in this document under [AxxSolder Station](#axxsolder-station) and [AxxSolder Portable](#axxsolder-portable).  
+The first thing to do after you have double-checked everything is to follow the steps under [Firmware update](#firmware-update). It is wise to do the first programming of AxxSolder without any handle piece and with only 3.3 V or 5 V power input, not VDD. After the programming is done you can now power up AxxSolder again via either with 3.3 V or 5 V, this time you can attach your handle. This allows you to test that your handle type is detected correctly (the detected handle type T210/T245 is shown in the display). The Standby feature can also be tested by touching the stand (STAND Input).  
+If the handle is detected correctly, the Standby function works and the display works you proceed to test the 5V DC/DC. This is done by once again disconnect the handle, but this time apply current limited 9-24 V VDD. 100 mA at 24 V is enough to check that the display starts and that you can measure the 3 bus voltages; 3.3V, 5V and VDD. If the the bus voltages looks good and the display shows the main screen you are ready to apply full VDD power and attach the soldering handle.  
+If you are not 110% sure about your soldering/connections it is wise to be on the safe side and keep your soldering tip in a waterbath in over to prevent it from over-heating in an uncontrolled manner. During the development this method was used and saved a few of thoese expensive JBC cartridges..
 
 # PID control
 As the thermal mass of each cartridge differs the PID parameters should in theory be adjusted to each different cartridge. As a matter of simplification the PID parameters are only different between the different handle types, T210 and T245. This gives a good enough PID performance in my tests. The Max allowed power is also different between handle types.