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--- projects:3dprinting:anycubic_i3_mega:redesign_hub_pcb [2020/11/09 01:01] – admin
+++ projects:3dprinting:anycubic_i3_mega:redesign_hub_pcb [2022/07/12 13:31] (current) – [Wiring the new circuit boards - internally] admin
@@ Line 27: / Line 27: @@
 ===== Redesign of the Mega Hub PCB =====
-Within a period of one year, the circuit board evolved into the current design((The three earlier [[projects:3dprinting:anycubic_i3_mega:redesign_hub_pcb_v1_v2_v3|iterations are described here]].
+Within a period of one year, the circuit board evolved into the current design((The three [[projects:3dprinting:anycubic_i3_mega:redesign_hub_pcb_v1_v2_v3|predecessors are described here]].
 )) which has the following features:
   * ESD-protection on all pins which are connected to the controller.
@@ Line 37: / Line 37: @@
 |  //Top//  |  //Bottom//  |
-The ESD-protection is an absolute necessary requirement for everyone who is experimenting with changing external hardware. Without protection, the risk of ESD damage is high due to the fact that the original temperature input is wired unprotected to the controller.((This can easy happen to the heatbed temperature sensor, connected to the Atmega2560, Pin 83 (Analog 14), with an external pull-up resistor of only 4k7.))
+The ESD-protection is an absolute necessary requirement for everyone who is experimenting with changing external hardware. Without protection, the risk of ESD damage is high due to the fact that for example the original temperature input from the heatbed is wired unprotected to the controller.((The heatbed temperature sensor is connected to the Atmega2560, Pin 83 (Analog 14), with an external pull-up resistor of only 4k7.))
 The new circuit board fits at the original location. The breaking-off circuit board (using so-called mouse-bites) is meant to be located at the other side of the printer and provides connections for the X-stepper, Z-stepper-Left and accordingly endswitches.
-The reason that the original external dual row 2mm connectors were abandoned is that these are neither very robust, nor do they offer much flexibility in respect to upgrading/changing the printer.
+{{ :projects:3dprinting:anycubic_i3_mega:img_20201109_234033b.jpg?direct&400 |}}
+The reason that the original external dual row 2mm connectors were abandoned is that these are neither very robust, nor do they offer much flexibility in regard to upgrades/changes.
 The schematic diagram and pinout of the board can be downloaded from here:
@@ Line 47: / Line 49: @@
   * {{ :projects:3dprinting:anycubic_i3_mega:i3_mega_hub4-pinout.pdf|Pinout / Pin description of the connectors at the circuit board.}}
-To housing need to be slightly modified for the D-sub connectors. For details, [[projects:3dprinting:anycubic_i3_mega:new_hub_pcb_mechanical|see this page.]]
+The housing needs to be slightly modified for the D-sub connectors. For details, [[projects:3dprinting:anycubic_i3_mega:new_hub_pcb_mechanical|see this page.]]
 ===== Wiring the new circuit boards - internally =====
-Internally the following cables need to be made:
+To understand how the wiring needs to be modified, please look at the following diagram. It shows how the protection works in principle:
-  * todo.
+{{  :projects:3dprinting:anycubic_i3_mega:esd_principle2.png?direct&500  |}}
+The most important connection point for ground is realized using a [[https://www.we-online.com/katalog/datasheet/7461096.pdf|Würth REDCUBE PRESS-FIT T-Block]] (Art. Nr. 7461096), which has M4 thread and can be used to establish a connection with very low impedance. No negative or ground wire shall be routed directly between the power supply and the controller circuit board. Instead, all these wires need first to go the T-Block and from there to the controller.
 ===== Wiring the new circuit boards - externally =====
-The following parts have been acquired. Supplier was Farnell (Develektro)
+The following parts have been acquired. Supplier was Farnell:
 ^ Position ^ Part ^ Manufacturer ^ Manufacturer code ^ Farnell ^ Description ^
 | 1 | D-sub Connector Backshell | MH CONNECTORS LTD. | MHDVSL9-K | 2532964 | DMHDVSL Series Zinc Angled |
 | 2 | D-sub Connector Backshell | MH CONNECTORS LTD. | MHDVSL25-K | 2532963 | DMHDVSL Series Zinc Angled |

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