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Digital and analog I/O ports that can be used directly from within your Java code. The performance of the new ARM Cortex A8 MCU at 1Ghz (that manages the User Interface) coupled with an ARM M3 (that manages the I/O logic) allows to use this product in many situations where precision, reliability and efficiency are needed.

pLtouch 101 at work

The Pltouch is an HMI with a 7" capacitive touch screen, running Android 4.0 and with additional

The board can be easily used in many fields, from industrial to home automation, from prototyping ideas to concrete projects.

Safety guide lines

Read carefully the safety guidelines and programming instructions contained in this manual before using/ connecting the device. Disconnect power supply before proceeding to hardware settings or electrical wirings. Only qualified personnel should be allowed to use the device and/or service it and in accordance to technical data and environmental conditions listed in this manual. Do not dispose electric tools together with household waste material. In observance European Directive 2002/96/EC on waste electrical and electronic equipment and its implementation in accordance with national law, electric tools that have reached the end of their life must be collected separately and returned to an environmentally compatible recycling facility.

Electrical wirings

Although this controller has been designed to resist noises in industrial environment, please notice following safety guidelines:

    • Separate control lines from the power wires
    • Avoid the proximity of remote control switches, electromagnetic meters, powerful engines.
    • Avoid the proximity of power groups, especially those with phase control.

Technical Specifications

  • MCU
    • Samsung ARM Cortex A8, 1Ghz
    • 45nm architecture
    • 512MB DDR2 (supports up to 1GB)
    • 0.65mm pitch, 17x17mm2 FBGA package
    • 32KB data and instruction caches, 512KB L2 cache
    • 64-bit multi buses
    • powerful built-in PowerVr Sgx 3D graphics engine
    • supports MPEG4, H.263, H.264 1080P@30fps encode/decode and MPEG4 1080P@30fps decode
    • up to 80 Mpixels/s Jpeg decoding
    • HDMI
    • supports LCD/Camera with MIPI interface
  • Memory
    • 512 DDR2 on board
    • 2x SD
  • Flash
    • 4GB onboard iNand
  • Connections
    • Ethernet
    • 4x USB Host 2.0, support multiple level espansion
    • USB OTG
    • 2x UART, support flow control
    • RS485
  • Video
    • LCD interface: support different size LCDs on TTL/LVDS
    • Touch screen interface: support 4/5 lines resistive/capacitive touch sensing
    • 2x Camera interface
    • HDMI interface
  • Audio
    • MIC/Out AC97
  • Power supply
    • VDC 24 @ 1.5A
    • Operating temperature -10~70°C
    • Storage temperature -10~80°C
  • Ingress Protection Code
    • IP54 or IP40


Compared to the Ltouch F or Ltouch FW, the Pltouch has the following additional I/O ports:

X1 Connector Specifications

Pltouch X1 connector
Pin Description
back jump for back o.s. Android
back jump for back o.s. Android
NC2 not connected
NC1 not connected
A bus RS485(+)
B bus RS485(-)
GND Common RS485
PE Ground case
+24Vdc Power supply pLtouch
0V Power supply pLtouch
COM INPUT Common input for digital inputs
COM INPUT Common input for digital inputs

The figure on the right contains the pin numbering.

PID function

There are two pid functions ready for work
PID (1):
The first function (1) corresponds to the analog input 1 and coupled to the analog output 1.
Analog Input 1 (0..20 mA) clamp VA0
Analog output 1 (0..10 volt) clamp VO0
(0..20 mA) clamp AO0

PID (2):
The second function (2) corresponds to the analog input 2 and coupled to the analog output 2.
Analog Input 2 (0..20 mA) clamp VA1
Analog output 1 (0..10 volt) clamp VO1
(0..20 mA) clamp AO1

We use this algorithm for the pid function:



    • Kp = Proportional gain parameter
    • ε = Offset
    • Kd = Derivative gain parameter
    • Td : Constant differential time
    • Ti : constant integral time

To enable the function pid write:
Starts/Stop the PID function
pManager.setPidStatu(function, value);
**function Specifies which function to start/stop: 1 or 2
**value True to start, false to stop

To change the value of set point write:
Set the Pid Set Point
**function Pid function to consider
**value Set point to set

To setting all parameters of function PID write:
Set Pid parameters
function Pid function to consider (1 or 2)
**direction Movement direction (0 or 1)
**kp Proportional gain parameter
**ki Integral gain parameter
**kd Derivative gain parameter
**ts Ts sampling time (ms)

PWM function

A dedicated PWM function will be published soon.


Pltouch01.jpg Pltouch02.jpg Pltouch03.jpg PLtouch04.jpg Pltouch05.jpg

Technical Drawings

Dim.jpg Dim01.jpg Dim03.jpg

Hardware Interface

Ethernet interface

  • The pLtouch supports the Ethernet interface, using the DM9000CEP fast Ethernet controller.

Earphone interface

  • The onboard earphone jack provides audio output to earphone or power amplifier.

SD card slot

  • The pLtouch provides two SD card slots, as shown in the picture above, the left one for SDIO channel 3, the right one for SDIO channel 2. Note that the SDIO channel 0 has been used for inand, therefore, when starting-up from SD card, the card SHOULD be inserted into the right slot, otherwise the start-up will fail.

USB HOST Interface

  • The pLtouch provides 4 USB channels, supports USB devices such as mouse, keyboard, USB WIFI, USB Bluetooth, USB 3G, etc.

RTC battery

  • The backup battery is used to keep RTC working when power down.

HDMI interface

  • Supports HDMI output via the onboard mini HDMI interface and an additional mini HDMI cable. Audio/Video signals can be presented on terminal devices which support HDMI1.3 protocol.


  • The pLtouch supports external loudspeaker via onboard pin header.


Please take a look at Ltouch/Pltouch customers' frequent asked questions concerning:

A dedicated FAQ section specific to the Pltouch I/O pins will be published soon.


The Pltouch is an Android-based HMI with an additional set of I/O ports. In the following link you can get the most frequent Android related tips you might need while using the product:

External Links


This documentation is licensed under the Creative Commons Attribution-ShareAlike License 3.0

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