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Lenovo Open Source RK3399 based AM5708 SBCs

Posted on by Tope Oluyemi

Lenovo has recently ventured into the community-backed SBC market, flagging off with a Rockchip-based board. They follow suit with fellow PC makers Asus. Their flagship Leez P710 boasts a more powerful, hexa-core Cortex-A72 and -A53 Rockchip RK3399 than that of the Asus Tinker Board’s RK3288. The Leez P710 was announced last February at Mobile World Congress and has been launched on AliExpress for $141.

At 85 x 85 x 15mm, the Leez P710 is dubbed the Smartfly Leez SBC P710 on AliExpress. It has the same price range as the early set of Rockchip RK3399 development boards like, the $149 and up Firefly-RK3399. For $141, you get 4GB LPDDR4, 16GB eMMC, WiFi/BT, and a heatsink. The $149 package includes a 5V/3A power adapter, a USB Type-C, and USB/serial cables. The $169 or $173 package gets you a camera, and the $177 package offers a 4G M.2 module. Finally, the $258 package offers a 10.1-inch touchscreen in place  of the camera or 4G. Lenovo also posted pinouts, and also schematics and images for Ubuntu and Android 7.1 and 9.0. The SBC is targeted at applications for digital billboards, new retail, face recognition, and service robots.

Leez P710 board details

The specs listed adds a 2GB RAM option, but its not clear if it’s currently available. Available also is a microSD slot in addition to the 16GB eMMC, and also a GbE port, a wireless module with 802.11ac and Bluetooth 5.0. The M.2 B-key 3042 slot offers support for the optional 4G module, also featuring and a micro-SIM slot and an IPX connector. For display features, there are triple simultaneous displays via an HDMI 2.0a port, and a USB 3.0 Type-C port with DisplayPort 1.2 support. They both offer 4K@60 video. However, the third display interface is 4-lane MIPI-DSI. It also has 2- and 4-lane MIPI-CSI, headphone jack, and a mic interface. Available also is a second Type-C for power input and a pair of USB 2.0 host ports. Additional feature set includes 40- and 8-pin GPIO connectors, a debug header, an RTC with battery connector, and power and recovery keys.

 Lenovo also announced an upcoming Leez P515 SBC based on the Sitara AM5708 and a Lenovo LeapIOT platform for industrial IoT management during the MWC

The Leez P515, is an open hardware board with a more industrial focus. At 92 x 65mm, the Leez P515 features the Sitara AM5708, one of Texas Instruments’ Cortex-A15 based Sitara AM57x SoCs.  The spec list shows GbE, HDMI, USB Type-C PD, and 2x USB 3.0 ports. Available also is a MIPI-CSI2 camera connector, 80-pin GPIO, and a connector for a WiFi/Bluetooth module. The spec list also reveals 1GB DDR3L-1333, 8GB eMMC, and a microSD slot. The Leez P515 is equipped with an optional 10/100 Ethernet port in addition to the GbE. The optional wireless module is equipped with 802.11ac and Bluetooth 5.0, and the HDMI 1.4a port is limited to 1080p@60 resolution. It has a -35 to 75°C operating range, powering at 5V/3A. No OS support is listed, but likely Linux or Ubuntu.

Lenovo Leez P515

Lenovo’s LeapIOT platform is designed to enable fast deployment of industrial IoT solutions with features like equipment connection, system coordination, and data analysis. The cloud-based IoT platform consists of more than 100 industrial and Big Data modules, which includes field data acquisition, industrial system connectivity, Big Data storage and computing engine, public and private cloud resource scheduling, script execution engine, and visualization of data analysis. LeapIOT functions with a separate, “enterprise level” LeapAI platform for analytics. The LeapIOT platform consists of a LeapIOT Edge client component that runs on gateways and other devices like the Leez SBCs. The lightweight edge framework enables interfaces to industrial protocols and sensors through TCP/MQTT and RS485/232. Working with the cloud platform, it enables features like message queuing, real-time streaming, and digital twins.

LeapIoT Platform

The Leez P710 is available on AliExpress with price starting from $141 with 4GB RAM. There is no pricing or availability information for the Leez P515. More information about the Leez P515 can be found on Lenovo’s MWC teaser page, and more information on the P710  can be found on the AliExpress page and the GitHub page. More on LeapIOT can be found on Lenovo’s LeapIOT page.

3 axis gyroscope that act as potentiometer

Posted on by mixos

Replace any potentiometer with this motion control device in your project!

This 3 axis gyroscope is perfect for FPV head tracking, robotics, movement control and more… It allows you to track the movement of the head or arm and convert it in analog signals outputs, exactly like a potentiometer. Like other versions of the mhpro.net’s Gyroscopes, it can be configured as normal or reverse action mode. For Do It Yourself (DIY) home project lover who dreams of doing a movement tracking system himself. This system has been specially designed for DIY in electronics or robotics for all ages; people who want to explore electronics and want their own system, but are less comfortable with advanced programming of accelerometers. You can use one or more axes (X, Y, Z) independently. According to your needs.

The gyroscope outputs analog signals: 0 to input power voltage (5-12 volts) or 0 – 3.3 volts. Your choice. And independently for each axis. When turning on, the X and Y axis will output 2,5 volts (in case of 5 volts input) and will tend to 0 volt if you rotate the gyroscope one way (-90 degree) and tend to 5 volts the other way (90 degrees). The Z axis will do the same but with +- 180 degrees of rotation.

The project is live on www.kickstarter.com and has 57 days to go.

Free Elektor Article: Compact USB to Serial Converter

Posted on by mixos

The “legacy” serial port is still used a lot for interfaces between electronic devices and PCs. Here we present a compact implementation, based on the FT232H IC from FTDI, which can be connected over USB 2.0 after you install the right drivers. That gives you USB High Speed capability.

Schematic

Quick Features of the Project

  • USB 2.0 High Speed
  • Pin compatible with the FTDI-USB-TTL (UART) cable
  • Right-angle USB connector for space-saving mounting
  • Selectable 3.3 V or 5 V supply voltage on the output connector
  • Automatically recognized as a COM port (after installation of VCP drivers

Like what you’re seeing? The go to the article page and download a pdf copy of the full, original article. Downloading is free between Friday 6 December and Friday 13 December, 2019.

  • Original publication: Elektor Magazine no. 11/2015 on page 45.
  • Authors: Ton Giesberts (Elektor Labs) and Thijs Beckers (Netherlands Editorial)

USB Charging Port Controller using TPS2514

Texas Instrument’s USB Dedicated Charging Port Controller TPS2514 is specifically designed to implement the charging schemas mentioned below. An auto-detect feature monitors USB data line voltage and automatically provides the correct electrical signatures on D+ and D– data lines. Note that the chip datasheet never mentioned Samsung or Apple in particular apparently due to the copyright issues. Instead, it mentioned 1.2V mode and different Apple charging modes as Divider 1, Divider 2 and Divider 3. There are two modifications of the chip. TPS2514 has Dividers 1 and 2 for configuration #2 and #3 when TPS2514A only Apple Divider 3 for configuration #4. Both chips support DCP and Samsung charging. Note that Divider 1 or Divider 2 is configured by flipping connection to USB data lines. In other words, it is pre-wired and there is no way do it on the fly.

The TPS2514 IC is a USB dedicated charging port (DCP) controller. An auto-detect feature monitors USB data line voltage, and automatically provides the correct electrical signatures on the data lines to charge compliant devices among the following dedicated charging schemes:

  • Divider 1 DCP, required to apply 2 V and 2.7 V on the D+ and D– Lines respectively (TPS2513, TPS2514)
  • Divider 2 DCP, required to apply 2.7 V and 2 V on the D+ and D– Lines respectively (TPS2513, TPS2514)
  • Divider 3 DCP, required to apply 2.7 V and 2.7 V on the D+ and D– Lines respectively (TPS2513A, TPS2514A)
  • BC1.2 DCP, required to short the D+ Line to the D– Line
  • Chinese Telecom Standard YD/T 1591-2009 Shorted Mode, required to short the D+ Line to the D– Line
  • 1.2 V on both D+ and D– Lines

With TPS2514 device implementing the USB charging adapter is simple, see the schematic below. When charging Apple devices the current is limited to 1A as it is implemented Divider 1 charging schema with D+ = 2.0 V and D− = 2.7 V. Also, try to use good quality charging cables. The one particularly bad cable I was using introduced a significant voltage drop forcing my Samsung device switching to the slow charging mode.

Schematic

Features

  • Supports USB DCP Shorting D+ Line to D– Line per USB Battery Charging Specification, Revision 1.2 (BC1.2)
  • Supports Shorted Mode (Shorting D+ Line to D– Line) per Chinese Telecommunication Industry Standard YD/T 1591-2009
  • Supports USB DCP Applying 2.7 V on D+ Line and 2 V on D– line (or USB DCP Applying 2 V on D+ Line and 2.7 V on D– Line) (TPS2513, TPS2514)
  • Supports USB DCP Applying 2.7 V on D+ Line and 2.7 V on D– Line (TPS2513A, TPS2514A)
  • Supports USB DCP Applying 1.2 V on D+ and D– Lines
  • Automatically Switch D+ and D– Lines Connections for an Attached Device
  • Dual USB Port Controller (TPS2513, TPS2513A)
  • Single USB Port Controller (TPS2514, TPS2514A)
  • Operating Range: 4.5 V to 5.5 V
  • Available in SOT23-6 Package

PCB

TPS2514 Datahseet

Lumileds LUXEON IR ONYX Broadband Infrared Emitters

Posted on by mixos

Lumileds LUXEON IR ONYX Broadband Infrared Emitters feature a continuous broadband Infra-Red (IR) emission from 650nm to 1100nm with good light output characteristics. These IR emitters come in industry-standard 2720 package and footprint for easy integration in the existing designs. The IR spectrum consists of a broad, flat emission without any peaks, and enables ease of calibration. These LUXEON IR ONYX emitters offer over 40mW radiant power, reducing exposure time. Typical applications include spectroscopy, machine vision, healthcare, and hyperspectral imaging.

FEATURES

  • Continuous broadband IR emission from 650nm to 1100nm
  • Over 40mW IR (600nm–1050nm) radiant power that reduces exposure time
  • More than 80µW/nm over a broad range of 750nm–1000nm
  • 2.75mm x 2.00mm package with a 2 pad configuration that is compatible with the industry common footprint
  • Robust and long lifetime phosphors
  • Flat spectrum that allows for ease of calibration

more information: www.lumileds.com

SharpVue PLUS & SharpVue XT Digital Inspection Systems

Posted on by mixos

Aven’s SharpVue PLUS/SharpVue XT feature 30x optical magnification and DisplayPort and USB outputs.

Aven’s SharpVue PLUS and the SharpVue XT are two inspection systems built on the SharpVue legacy. The SharpVue PLUS combines cutting-edge technology with comfort and ease of use. The SharpVue XT has an innovative feature that allows users to upgrade their magnification or working distance as well as scan over larger objects.

SharpVue PLUS Features:

  • 30x optical, up to 300x digital magnification
  • DisplayPort and USB outputs
  • Built-in LEDs with on/off switch
  • Fixed 11 inch working distance
  • Autofocus camera
  • Includes remote control for on-screen settings

SharpVue XT Features

  • 30x optical magnification
  • DisplayPort and USB outputs
  • Adjustable vertical and horizontal positioning
  • Capture instant images to USB storage with no computer required
  • 22 inch post stand with 11.5 inch x 17.7 inch base
  • Auto focus camera
  • Includes remote

Video

more information: www.aventools.com

STEF01 – 8 V to 48 V fully programmable universal eFuse

Posted on by mixos

The STEF01 is a 8V to 48V fully programmable universal integrated electronic fuse optimized for monitoring output current and the input voltage on DC power lines.

When connected in series to the main power rail, it is able to detect and react to overcurrent and overvoltage conditions. When an overload condition occurs, the device limits the output current to a safe value defined by the user. If the anomalous overload condition persists, the device goes into an open state, disconnecting the load from the power supply.

The device is fully programmable. UVLO, overvoltage clamp and start-up time can be set by means of external components.

The adjustable turn-on time is useful to keep the in-rush current under control during startup and hot-swap operations. The device provides either thermal latch and auto-retry protection modes, which are selectable by means of a dedicated pin.

The STEF01 provides a gate driver pin for an external power MOSFET to implement a reverse-current blocking circuit. The intervention of the thermal protection is signaled to the board monitoring circuits through a signal on the fault pin.

Key features

  • Operating input voltage range: 8 to 48 V
  • Absolute maximum input voltage: 55 V
  • Continuous current typ.: 4 A
  • N-channel on-resistance typ.: 30 mΩ
  • Enable/fault functions
  • Output clamp voltage: adjustable from 10 to 52 V
  • Programmable undervoltage lockout
  • Short-circuit current limit
  • Programmable overload current limit
  • Adjustable soft-start time
  • Latch or auto-retry thermal protection
  • Maximum allowable power protection
  • Power Good
  • Drives an optional external reverse current protection MOSFET
  • Operating junction temperature -40 °C to 125 °C
  • HTSSOP14 package

more information: www.st.com

Free Elektor Circuit – An NE555 Watchdog Timer

Posted on by mixos

from an Idea by Wolfgang Borst (Germany)

Virtually every modern microcontroller has a built-in watchdog. It prevents the microcontroller ‘hanging’ which may be the result of a programming error or an unforeseen operating condition, where, for example, the program becomes trapped in an infinite loop and no longer reacts to external or internal input. In principle, this built-in watchdog feature is a timer that needs to be regularly reset by a special command within a certain time interval. If this command is not issued it indicates that the program has gone off-piste, the timer times-out and issues a reset. This will then initiate a system reboot.

So that covers every eventuality?

Well, not necessarily, in very rare cases CMOS circuits – and a microcontroller is just that – can suffer a latch-up condition. In this state nothing works and even a reset cannot bring the microcontroller to its senses. If you want to prevent this rare condition, you will need to rely on an external watchdog mechanism. Those of you familiar with the works of Murphy will know that his First Law states that if anything can go wrong, it will. If you ignore the possibility of latch up, it will come back and bite you… eventually.

Free Elektor Circuit – An NE555 Watchdog Timer – [Link]

Maduino Zero NFC is an IoT Solution

Posted on by mixos

Maduino Zero NFC is an IoT (Internet of things) Solution based on the 32-bit Atmel’s SAMD21 MCU and NXP Near Field Communication Controller PN532, which is can be used for pay application, entrance guard system etc.

The Maduino Zero NFC based on the Arduino, users can program it with Arduino IDE, which is very easy especially suit for the none-programmers. There are also guide for users to learn how to use this board, with which the starters can learn the hardware and programming skill quickly.

Features

  • ATMEL SAMD21G18A: 32-bit ARM® Cortex®-M0 up to 48MHz, 256KB flash, 32KB SRAM, LQFP48
  • Powered by lithium battery(3.4-4.2V) or MicroUSB
  • NXP PN532，Near Field Communication (NFC) controller
  • Contactless communication at 13.56 MHz
  • PCD mode for FeliCa, ISO/IEC14443-3 Type A, Mifare, ISO/IEC14443-4 Type A and Innovision Jewel cards
  • Interface: I2C/SPI/UART/ADC/DAC/I2S/38*GPIO
  • Arduino Compatible: You can play it with Arduino IDE
  • More cost-effective and high quality than Arduino Zero
  • Working Temperature: -20 ~ +85℃
  • Default baud rate: 115200bps
  • Size: 40*55mm

more information and usage guide on www.makerfabs.com

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