update step 4

doc/source/Ohmpi_V2_00/V2_00_step_04.rst

+
+**STEP n°4:** assemble Ohmpi 
+****************************************************
+   
+.. table::
+   :align: center
+   
+   +--------+------------------------------------------------------------+
+   |        |   .. image:: step_n_4/step_4_1.jpg                         |
+   |      1 +------------------------------------------------------------+
+   |        |Cut 4 ribbon cables composed of 16 wires each to the proper | 
+   |        |length (about 1.5m). Each wire corresponds to an electrode. |                                                                      
+   +--------+------------------------------------------------------------+
+
+.. table::
+   :align: center
+
+   +--------+------------------------------------------------------------+
+   |        |   .. image:: step_n_4/step_4_2.jpg                         |
+   |      1 +------------------------------------------------------------+
+   |        |Crimp the ribbon cable on the corresponding idc connector   | 
+   |        |with a suitable clamp. Pay attention to the direction of the|                                                                      
+   |        |cables. Unbalanced IDC connector. The ribbon cable must be  | 
+   |        |perpendicular to the connector.                             |
+   +--------+------------------------------------------------------------+
+   
+   
\ No newline at end of file

doc/source/V2_00.rst

@@ -74,6 +74,7 @@ Ohmpi 2 step by step
    Ohmpi_V2_00/V2_00_step_01
    Ohmpi_V2_00/V2_00_step_02
    Ohmpi_V2_00/V2_00_step_03
+   Ohmpi_V2_00/V2_00_step_04