Differences

This shows you the differences between two versions of the page.

--- gca-pi03-en [2018/12/04 14:54] – [GCA-PI03 16 PWM Channel I2C board for Raspberry Pi.] rjversluis
+++ gca-pi03-en [2023/05/11 21:05] (current) – [Setting dip switch on SW1 position (green pcb only)] phg
@@ Line 34: / Line 34: @@
 The external 5V, connected to V5 USB connector, is used to supply the servo's.\\
-Instead of the USB connector, a screw terminal block with 0,15'' or 0,2'' spacing can be used.\\
+**Be aware that this is essential for a correct functioning of the RocNet network.**\\
-The chips on this board are supplied from the 5Volt on the lines between the boards.\\
+**The momentary high current in Servo's cannot be supplied by the RocNet cables!**\\
+Instead of the USB connector (which is only capable of max 1 Amp), a screw terminal block with 0,15'' or 0,2'' spacing can be used.\\
+The chips on this board are supplied from the 5 Volt as availbale in the RocNet connections cable.\\
 Jumper JP1 is used to connect external 5V to I/O1 and I/O2, or internal (line) 5V.\\
 leds signal the internal (Line) 5V and the external 5V.\\
@@ Line 66: / Line 68: @@
   - JP1 in pos 2 (on board indicated) : IO 01 / IO 02 get 5 V from V5 connector.\\
-**Note :   V5 USB connector could also be replaced by normal screw-terminal as delevered with ADAfruit board.**\\
+  * **Notes:**
-===== Setting bridge wire on SW1 position (green pcb only) =====
+    * V5 USB connector could also be replaced by normal screw-terminal as delevered with ADAfruit board.
+    * :!: Several forum posts report malfunctions when servos receive their power supply via the I2C bus. \\ In the reported cases, the high power requirements of the servos in the small wire diameters of the I2C cables result in undervoltage for the Pi modules. \\ **For this reason, servos should always be powered separately with their own power supply.**
+===== Setting dip switch on SW1 position (green pcb only) =====
 On green pcb the jumper is replaced by SW1\\
 === Functions of SW1 ===
 \\
-^  SW1(1) ^  SW1(2)  ^  Function  ^
+^  SW1(1)  ^  SW1(2)  ^  Function  ^
 |  OFF  |  OFF  |  no supply to Servo's and I/O1,2  |
 |  ON  |  OFF  |  do not use  |
-| OFF  |  ON  |  5V supply for servo's should be connected via V5  \\  5V supply for I/O1,2 comes from RocNet supply  |
+|  OFF  |  ON  |  5V supply for servo's should be connected via V5  \\  5V supply for I/O1,2 comes from RocNet supply  |
-| ON  |  ON  |  5V supply for Servo's and for I/O1,2 comes from RocNet supply  |
+|  ON  |  ON  |  5V supply for Servo's and for I/O1,2 comes from RocNet supply  |