Wiring

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Layout Control Bus (LCB)

Power distribution

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Operating Voltages
    Mega2560. Vin (recommended) 7-12V. Vin (limit) 6-20V
    Nano. Vin (recommended) 7-12V. Vin (limit) 6-20V
    555. Vin (recommended) 16V. Vin (limit) 18V
    L272 op amp. Vin (recommended) 4-24V. Vin (limit) 28V
    (LM)78(L)05 to 7818 regs. Dropout 2V. Vin (limit) 35V
    LM317/337 regs. Vin-Vout (recommended) 3-40V. Vin-Vout (limit) 40V  
    Voltmeter, 3-digit, 3-wire. Vin 4.5V to 28V 
    Volt + Amp meter. Vin 4V to 30V

100Volt/10Amp meter

(top) £2.69 
LED DC 0-100V 10A Digital Voltmeter Ammeter

    Working voltage of Meter itself:DC 4 - 30V

(The maximum input voltage can not exceed 30V. Otherwise the meter will be burned)

    Working current of Meter itself:≤20mA
    Voltage Measuring range:DC 0 - 100V
    Current Measuring range:DC 0 - 10A
    Voltage resolution (V):0.1V
    Current resolution (A):0.01A
    Measure accuracy:1% (± 1 digit)
    Display:0.28" digital tube, Two color blue and red
    Refresh rate:about 300mS / times
    Dimensions:48mm*29mm*26mm
    Operation Temp:-10℃-+65℃Wiring:

15Vswitch controlled by 5V logic

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LM2596 4-40V to 1.25-37V, 2A DC Buck Converter module with Voltage Display

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£4.45 

Input: 4 - 40VDC. Output: 1.25-37VDC adjustable, 2A.
Input reverse polarity protection. Output short protection. Thermal shutdown.
L x W x H =6.1*3.4*12 cm. Weight: 22g
Voltmeter range: 0 to 40V, error ±0.1V. 
Press the right key to show the input or output voltage. 
When the right "OUT" led lights, it shows output, the left "IN" led show input.

(1) Output voltage meter calibration steps. Voltage display resolution is 0.1V.
Step 1, Adjust right button so "OUT" LED is on, voltmeter shows output voltage; 

        Press right button for more than 2 seconds, release, voltmeter and "OUT" LED 
            flashes in synchronization indicating output voltage calibration mode.

Step 2, Press the right button (normal speed), the voltage value is adding up a unit; 
        press the left button, minus a unit; 
        Adjustment step may be less than 0.1V, depending on the current display voltage.
        You may need to continuously press 1-5 times to see the voltmeter change 0.1V.
            the higher the voltage, the fewer the number of presses needed.

Step 3, Press right button for more than 2 seconds, release, to exit calibration mode. 
        All parameters set to automatically power down to save.

(2) Input voltage meter calibration steps
Step 1, Adjust right button so "IN" LED is on, voltmeter shows input voltage; 

        Press right button for more than 2 seconds, release, voltmeter and "IN" LED
            flashes in synchronization indicating input voltage calibration mode.

        Steps 2 and 3, as with the output voltage calibration method.

If the module output Voltage can not be adjusted, the output voltage is always equal to the input voltage 
please rotate counterclockwise the potentiometer 10 turns or more, then you can adjust the output voltage.

6-24V to 5V, 2A DC Buck Converter

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£2.95

3.3-11V to Dual +12V, 700mA and -12V, 150mA DC Boost Converter

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£2.40

Dsub25 connections

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St Blazey Par North Par Fowey
13 GL Vi 1 FR N Pi
12 GL Pink 25 0V 2 FR L Vi 14 [0V]
11 DL Vi 24 +V 3 RXouter Vi15 [+V]
10 DL Pink 23 -V 4 RXinner W 16 [-V]
9 PM Vi 22 5 RP N Pi 17
8 PM Pink 21 6 RP L Vi 18
7 TR Vi 20 7 PR N Pi 19
6 TR Pink 19 8 PR L Vi 20
5 TU Vi 18 MIO 5V 9 21
4 TU Pink 17 CBUS +V Pi 10 22
3 SU Vi 16 CBUS Lo Y 11 23
2 SU Pink 15 CBUS Hi Gy/Be 12 24
1 14 CBUS 0V Bn 13 25
top row
lower row
North
top row
lower row
13 1 I2C SDA Bn
12 25 0V 2 I2C Vcc Be 14 MPX 0V
11 24 +V 3 I2C GND Y 15 MPX 08
10 23 -V 4 I2C SCL Pi 16 MPX 09
9 22 MPX 07 5 R 5V USB3 17 MPX 0A
8 21 MPX 06 6 W D- USB3 18 MPX 0B
7 20 MPX 05 7 Gn D+ USB3 19 MPX 0C
6 19 MPX 04 8 Bk 0V USB3 20 MPX 0D
5 R 5V USB1 18 MPX 03 9 Screen USB3 21 MPX 0E
4 W D- USB1 17 MPX 02 10 22 MPX 0F
3 Gn D+ USB1 16 MPX 01 11 RXinner W 23 -V
2 Bk 0V USB1 15 MPX 00 12 RXouter Vi 24 +V
1 Screen USB1 14 MPX 0V 13 25 0V
St Blazey Par North Par Fowey
St Blazey Par South Par Fowey
13 1 PR N Pi
12 25 2 PR L Vi 14
11 24 3 PB N Pi 15
10 23 4 PB L Vi 16
9 22 5 17
8 TR Vi 21 6 18
7 TR Pink 20 7 19
6 UL Vi 19 SU Vi 8 20
5 UL Pink 18 SU Pink 9 21
4 LU Vi 17 RT Vi 10 22
3 LU Pink 16 RT Pink 11 23
2 LD Vi 15 PB Vi 12 24
1 LD Pink 14 PB Pink 13 25
top row
lower row
South
top row
lower row
13 not present 1
12 25 2 14
11 24 3 15
10 24 4 16
9 22 5 17
8 21 6 18
7 20 7 19
6 19 8 20
5 18 9 21
4 17 10 22
3 16 11 23
2 15 12 24
1 14 13 25
St Blazey Par South Par Fowey