UniPi User Manual
REV 1.0
MYSH
UniPi
Contents
Overview.................................................................................................................................................. 2
Description .............................................................................................................................................. 2
GPIO port map ..................................................................................................................................... 3
Power Requirements ........................................................................................................................... 4
Connecting Raspberry Pi to UniPi........................................................................................................ 4
Connecting peripherals ........................................................................................................................... 4
Relays................................................................................................................................................... 4
Digital Inputs ....................................................................................................................................... 4
Power supply ................................................................................................................................... 4
Jumper settings ............................................................................................................................... 5
Analog Inputs....................................................................................................................................... 5
Analog Output ..................................................................................................................................... 5
1Wire sensors ...................................................................................................................................... 6
UART .................................................................................................................................................... 6
I2C ports ............................................................................................................................................... 7
Technical parameters .............................................................................................................................. 7
Onboard I2C ICs.................................................................................................................................... 7
Relays................................................................................................................................................... 7
Digital Inputs ....................................................................................................................................... 7
Power Requirements ........................................................................................................................... 8
Dimensions .......................................................................................................................................... 8
Revision History ....................................................................................................................................... 8
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UniPi
Overview
UniPi is an add-on expansion board for the Raspberry Pi. It features many components such as digital
galvanically isolated inputs with LED signalization, 0-10V analog inputs, 0-10V analog output,
changeover relays, single channel 1wire master controller and a real-time clock module.
UniPi is ready-to-use with the Raspberry Pi’s P5 header which can provide second I2C bus and two
additional GPIOs. To be able to use this feature, modification of the Raspberry Pi is necessary. See
our web pages for detailed documentation.
There are many freely available libraries for C/Python that are compatible with the UniPi board:



Webiopi – the perfect Swiss-knife to make connected things for Python
WiringPi – GPIO library for the Raspberry Pi with support of most of UniPi’s peripherals,
available for both C and Python
Adafruit – the best knowledge base for Raspberry Pi peripherals
There are also many tutorials for the UniPi available on our web pages www.unipi.technology
UniPi is also mounting-hole compatible with the BeagleBone Black, but it is not officially supported
for now.
Please note the UniPi is only compatible with Raspberry Pi model B rev 2. Connecting model B rev. 1
is also possible provided checking the Raspberry Pi official documentation.
Description
Major building blocks of UniPi:
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
12(+2)x galvanically isolated digital inputs
8x changeover relays via MCP23008 chip
2x 0-10V analog inputs via MCP3422
1x 0-10V analog output via PWM on GPIO 18
Real Time Clock Module with battery backup
12V power supply – Only for use with digital inputs of UniPi
Inputs configuration jumpers
1Wire RJ45 connector and 1Wire channel master DS2482
External I2C_0 RJ11 connector
UART RJ11 connector
P1 header connector
P5 header connector
Power connector (standard 2.1mm) and RPi power jumper
obrazek desky s popisem a cislama
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UniPi
GPIO port map
Table 1 - P1 header map
UniPi
AO
I01
I02
I03
I04
I05
I06
I07
I08
I09
I10
I11
I12
I2C1_SCL
I2C1_SDA
UART RX
UART TX
RPi GPIO
GPIO18
GPIO04
GPIO17
GPIO27
GPIO23
GPIO22
GPIO24
GPIO11
GPIO07
GPIO08
GPIO09
GPIO25
GPIO10
GPIO02
GPIO03
GPIO15
GPIO14
Function
PWM
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
I2C1_SCL
I2C1_SDA
UART0_RXD
UART0_TXD
Description
Analog Output 0-10V
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Digital Input
Internal I2C_1, RJ11 connector
UART RJ11 connector
Table 2- P5 header map
UniPi
I13
I14
I2C0_SCL
I2C0_SDA
RPi GPIO
GPIO31
GPIO30
GPIO29
GPIO28
Function
Digital Input
Digital Input
I2C0_SCL
I2C0_SDA
Description
Digital Input
Digital Input
External I2C_1
Table 3 - MCP23008 pin map
Relay
8
7
6
5
4
3
2
1
MCP23008
GP0
GP1
GP2
GP3
GP4
GP5
GP6
GP7
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UniPi
Power Requirements
There are two options of powering the UniPi board and Raspberry Pi:


Single power source (RPi and UniPi are powered from the same power source)
o jumper JP1 mounted
o 5V DC 2.5A through the UniPi power connector
o Raspberry Pi power connector not used
Dual power source (separated power sources for UniPi and Raspberry pi)
o jumper JP1 dismounted
o 5V DC 1A through the Raspberry Pi’s mini USB
o 5V DC 1.5A through the UniPi power connector
oprazki
Connecting Raspberry Pi to UniPi
Before first use, plug in the CR2032 battery to the battery holder. Powering the board without
battery may cause damaging the Real Time Module or other components on the UniPi.
Connecting UniPi to Raspberry Pi is pretty simple.
1.
2.
3.
4.
5.
6.
Make sure you have properly configured the power jumper – see powering requirements
Click in the two plastic spacers to the mounting holes of the UniPi
Using the provided 26pin cable connect the cable to the P5 header on the board
Click in the Raspberry Pi
Connect the other end of the 26pin cable to the RPi (make sure it is not twisted)
Plug in the power supply
For detailed tutorial describing assembling the P5 header visit our web page www.unipi.technology.
Connecting peripherals
Relays
Maximum relay switching power is limited to 250V AC/5A or 24V DC/5A, voltages over this limit must
be switched using external relay or contactor.
Relays are controller by the MCP23008 (address 0x20), see map of MCP’s GPIO to relays in Chyba!
Nenalezen zdroj odkazů.. Each relay has a green LED indicating its state.
There are three contacts for each relay named CO (change-over or C=connected), NO (normally
opened), NC (normally closed). By default contacts CO and NC are connected (NO is not connected),
by switching the relay on CO gets connected to NO (NC is disconnected). The default state of the
relay can be seen in picture XX.
Oprazki relatek podobne jak ma papouch?
Digital Inputs
These inputs can be triggered by 5-20V DC voltage with minimum pulse length of 5ms. For easy visual
reading their states all inputs are equipped with red LED.
Power supply
All inputs are primarily meant to be driven by the internal 12V power supply with 200mA overload
protection. Its voltage is by default wired out via the orange connector marked as 12V and also via
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UniPi
green P2 connector (see picture XXX). Please note that using the internal power supply for the inputs
the connected peripherals are galvanically connected to the UniPi.
Jumper settings
In case of use external power source, inputs must be configured be by the JP2 - JP5 jumpers. This
configuration must be done before powering to the UniPi. Using the external power supply and
proper jumper configuration provides galvanic isolation for its inputs.
Jumper description:

JP2
o
o
o

JP3
o
o
o

When switched to the side of the JP3 label inputs I01 and I02 act as input for signal
from the connected peripheral device via the external power source.
The ground of power supply for this inputs must be connected to P02.
Please note that to set I01 and I02 for ext. power supply make sure to switch JP2 first
and then JP3, after that you can safely connect the peripheral device.
JP4
o
o

Switching this jumper to the side of the JP2 label causes changing the P02 (green
connector) to act as an input for ground from the external power source. Otherwise
P02 is connected to the 12V output.
This step must be done at first when changing jumper settings.
Please note that after this step, the GND of UniPi is connected to P02! Make sure to
proceed with JP3 settings after this step.
When switched to the side of the JP4 label inputs I03 and I04 act as input for signal
from the connected peripherals via the external power source.
The ground of power supply for this inputs must be connected to P01.
JP5
o
o
o
When switched to the side of the JP5 label inputs I05 and I14 act as input for signal
from the connected peripherals via the external power source.
The ground of power supply for this inputs must be connected to P01.
Please note that I13 and I14 are wired out via the P5 header of Raspberry Pi. See our
online documentation www.unipi.technology for assembly tutorials.
Picture XXX describes input configurations.
Analog Inputs
UniPi features two analog 0-10V input channels marked as AI1 and AI2. Each channel has its own +
and – (e.g. AI1+ and AI1-). The + connector expects positive voltage from the connected device and –
expects the negative pole (the GND). See picture XXX for detailed description.
Analog Output
Analog output is driven by the GPIO 18 PWM signal and is designed to run at 100Hz. The GPIO port is
galvanically isolated from the rest of the output. This output is able to control 0-10V analog output.
The maximum current driven from this output is 20mA. This output is meant to control 3rd party
devices that can adjust its power according to the 0-10V.
External voltage must be connected to the AOV connector with maximum voltage of 35V DC.
Make sure to adjust output voltage using the blue trimmer (labeled as R49) before connecting
devices to avoid causing damage.
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1Wire sensors
UniPi features single channel 1Wire master controller (DS2482-100, address 0x18). The 1Wire bus is
wired out via the RJ45 connector (see Table 4 for detailed description). The data line is ESD protected
and the 5V power current is limited to 200mA.
RJ11 pin
1
2
3
4
5
6
7
8
Function
5V
DATA
GND
Table 4 - 1Wire RJ45 connector
UART
The UART interface of Raspberry Pi is wired out via the RJ11 connector labeled UART. See Table 5 UART RJ11 connector. This port does not have any protection, so make sure to be careful when
connecting devices.
RJ11 pin
1
2
3
4
5
6
Function
5V
RX
TX
GND
-
Table 5 - UART RJ11 connector
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UniPi
I2C ports
Raspberry Pi has two I2C interfaces. The I2C _1 is wired out via the main P1 connector and does not
need any special modification. All the onboard ICs are connected to this bus. The second I2C bus,
I2C_0, is wired out via the P5 connector which needs to be soldered from the bottom of the
Raspberry Pi. Please check our online tutorial for further information.
The I2C _1 is by default also wired out via the onboard RJ11 connector and features ESD protection.
RJ11 pin
1
2
3
4
5
6
Function
5V
I2C clock (SCL)
I2C data (SDA)
GND
-
2
Table 6 - I C RJ11 connector
Technical parameters
Onboard I2C ICs
All onboard I2C chips are connected to the main bus.
Table 7 - I2C chip addresses
Chip type
MCP23008
DS2482-100
MCP79410
MCP3422
24AA00
Address
0x20
0x18
0x6F, 0x57
0x68
0x50
Usage
Relays
1Wire master
Real Time Clock
ADC
EEPROM
Relays

8x Omron G5LA-1-E: 250V AC/5A or 24V DC/5A
Digital Inputs

14x 5-20V DC, min 5msec pulse
Analog Output


Maximum input voltage: 35V
Maximum output current: 20mA
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UniPi
Power Requirements



The main UniPi power connector is standard 2.1mm
5V 2.5A DC in single power supply mode (JP1 connected)
When JP1 disconnected
o 5V 1.5A DC for UniPi
o 5V 1A DC for Raspberry Pi
Dimensions
Pavol!
Revision History
Revision Release date Author
1.0
1. 7. 2014
Tomas Hora
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