ntroducing the Propeller Activity Board


Do more with eight cores.  Harnessing the power of the 8-core Propeller microcontroller is now easier than ever before!  With built-in sockets and pre-written C libraries, Parallax provides the resources for you to bring your project from idea to reality.


The Propeller Activity Board gives you direct access to the most popular Propeller peripherals:

  • XBee socket — control or receive data from your invention wirelessly
  • microSD card holder — log sensor data or add WAV files
  • Mini audio/stereo jack — listen to those WAV files or synthesized speech
  • 3-pin headers — quickly connect to servos, serial LCDs, etc.
  • Breadboard — build and rebuild circuits without soldering (or desoldering!)
  • A/D and D/A converters — read or set the voltage your project needs
  • USB or power supply — the choice is yours

Explore the Propeller C Tutorials and see just how easy it is to digitize your creativity.

Propeller Activity Board Roadmap

Buy a Propeller Activity Board from the Parallax Store

…and download the Product Guide and Open Source files too!


Heating, ventilation, and air conditioning (HVAC) systems are becoming more sophisticated

Block Diagram

Click on the colored blocks to view or sample recommended solutions



Design Considerations

Heating, ventilation, and air conditioning (HVAC) systems are becoming more sophisticated as manufacturers design features into the product that make them more reliable, quieter, more efficient, and with a higher comfort level in ambient temperature. Texas Instruments offers products to meet the needs of these higher performance systems.

Energy Efficiency :

Digital signal controller systems save energy. Since most air conditioners operate with a light load, an inverter-controlled air conditioner can adjust the compressor motor speed for a light load by changing the frequency. This allows designers to use a high-efficiency compressor motor in the outdoor unit of the air conditioner.

Power Factor Correction (PFC) :

PFC is a technique of counteracting the undesirable effects of electric loads that create a power factor that is less than 1. PFC is needed because of the continuous transients and surge currents exhibited by the electric motor, and it is also used to boost the rectified mains voltage up to 300 V to 450 V, which is then used to power the 3-phase inverters which ultimately operate the electric motor. With TI products, PFC can be performed externally with a separate integrated circuit or it can be done in the digital signal controller eliminating the need for a separate external PFC controller.

High-Voltage Isolation :

For larger, higher-performance systems where reliability and motor-control accuracy are key concerns, TI offers isolation products that block high voltage, isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging sensitive circuitry.

Integration :

Texas Instruments provides fully-integrated solutions such as the digital signal controllers (for digital motor control, PFC, and other system functions), and relay drivers that provide up to 8 channels, zero-volt detection, and 5 V linear regulation for 5 V logic that may reside on the board.

Home Network :

A home mesh network consisting of home appliances, audio/video equipment, HVAC system, lighting fixtures, etc connected wirelessly and controlled via a remote control is possible today with TI’s ZigBee™ products. TI provides customers with industry-leading ZigBee™ -compliant solutions and a broad range of proprietary RF-ICs that enable innovative low-power RF applications. HVAC and thermostat (or indoor controller unit) manufacturers can develop products that wirelessly communicate with each other. Furthermore, temperature settings can be controlled via a remote control unit. With low-power wireless solutions from TI, home owners will benefit from a universal remote control that: 1. Does not require line-of-sight 2. Has an increased range such that one can remotely control any ZigBee™ device from anywhere in the home. 3. Allows for two-way communication.

Power Management :

Offline 24 V power supply lines are typically available in most homes. TI offers buck controllers and linear regulators that convert this offline voltage to something the microcontroller on the thermostat or indoor controller unit can use either 3.3 V or 1.8 V typically.Image

Power Line Communication (PLC) Solutions


TI’s PLC modem systems provide the best performing communication platform for today’s Smart Grid networks around the world.

Modern PLC networks utilize OFDM modulation techniques to increase data throughput rates and reliability in inherently noisy environments such as electric grids. And due its successful history of OFDM expertise Texas Instruments has long been a pioneer in developing OFDM communications technology.

TI’s PLC solutions provide the flexibility of a single hardware and software design that can support multiple standards and therefore a single global platform, which reduce R&D costs and speed time to market.

Solution Features:

  • Complete, certified and field-tested PLC modem for worldwide PLC standards
  • Fully integrated AFE031 analog front end for PLC supports FSK, SFSK, OFDM (PRIME, G3 compliant) in the CENELEC frequency band; Direct digital interface to TI PLC processor with up to 20-VPP output at 1.5 A
  • Optimized TMS320FPLC83 Piccolo MCU executes all of the PLC algorithms from the low level physical layer through the networking layer
  • TMDSPLCKIT-V3 C2000™ Power Line Modem Developer’s Kit includes two PLC modems, PRIME or G3 PLC software, built-in USB JTAG emulation, all necessary power and connection cables, 32KB limited Code Composer Studio™ (CCS) integrated development environment


Find recommended devices, tools and software for PRIME, GE, Data Concentrator, G3 Data Concentrator, G3 FCC and PLC-Lite™ on the PLC products page.

Smart Grid and Intelligent Control Applications

Power line communications technology enhances intelligence and reliability across a broad range of smart grid applications, including smart electrical meters, lighting, solar, electric car charging, smart appliances, home automation, intelligent building control, and networking. Suited for applications such as smart metering and control applications, TI offers a robust low frequency narrowband PLC technology ensuring data integrity while lowering power consumption and reducing system cost. Developers also speed design, tuning, and testing with the TI plcSUITE™, a comprehensive development platform offering programmable modulation and protocol libraries within a complete software framework. TI’s PLC roadmap will provide developers with PLC solutions for every stage of the Smart Grid from utility substations to the entire home

Electrical project plan

No. Design Documentation Download
1 Medium Voltage Metal-Clad Switchgear 24kV, type MCSet (ACAD drawing) Please login first | Get Download Updates | Get Technical articles
2 Medium Voltage AIS Switchgear 10kV, type SM6 (ACAD drawing) Please login first | Get Download Updates | Get Technical articles
3 Low Voltage Switchboard, 3200A, type Prisma P (ACAD drawing no.1) Please login first | Get Download Updates | Get Technical articles
4 Low Voltage Switchboard, 3200A, type Prisma P (ACAD drawing no.2) Please login first | Get Download Updates | Get Technical articles
5 Low Voltage Switchboard, 5000A, type OKKEN (ACAD drawing) Please login first | Get Download Updates | Get Technical articles
6 Electrical Plan – Sockets, Power Distribution And Lighting (ACAD drawing) Please login first | Get Download Updates | Get Technical articles
7 Medium Voltage Metal-Clad Switchgear 20kV type NXAir Please login first | Get Download Updates | Get Technical articles
8 Danfoss – VLT wiring diagrams (ACAD drawing) Please login first | Get Download Updates | Get Technical articles
9 TRIHAL Transformer – wiring diagrams star New Please login first | Get Download Updates | Get Technical articles


MDS Wireless PLC and SCADA data transmission radio system in the Waterworks

MDS Wireless PLC and SCADA data transmission radio system in the Waterworks




S7-200 PLC to the terminal for the on-site water supply wireless dispatch system composition and function. And focus on the PLC Modem with Wireless Interface and PLC software design into the analysis and explanation, given some of the process flow diagram and system applications.

[Key words]
  Programmable Logic Controller (PLC) Monitoring data radio   communication interface   IPC   MCGS configuration software
  an overview of
  a water plant control systems located in more than ten kilometers from the five deep water pumping stations, storage tanks, a network of user control. Gap between the level of the water supply system up to 150 meters, due to the water supply system, the special structure of the composition and topography, the last artificial control, to production management, water supply scheduling inconvenience.
  implemented a computer monitor because it can real-time monitoring of the main parameters of the water supply system (such as pressure, flow, level, voltage, current, etc.), control of deep well pump, to monitor the operational status of pumps, while providing the necessary production management statements, curve, data query functions. It runs on the safety of water supply systems, scientific control of great significance.
  2, system
  computer monitoring system uses the master-slave structure of distributed wireless real-time monitoring method (referred to as SCADA), shown in Figure 1.


  system consists of monitoring centers, wireless communication systems, on-site monitoring devices, sensors and instrumentation in four parts.
  control center: the computer, MCGS configuration software, wireless data radio, omni antenna, and UPS mimic panel composed of the main terminal to complete the on-site real time data acquisition, monitoring, control, data storage, printing reports, data query and so on.
  wireless communication system: pump station monitoring center and the use of wireless communication terminals. Monitoring center to active stations, and other passive terminal station from the station vice, the system uses radio management committee given the data frequency to one way and from the station-to-multipoint communication, control centers for the omnidirectional antenna, the deputy station directional antenna.
  site surveillance terminal: the core of the PLC, is an intelligent device, it has its own CPU, and control software, mainly to complete the field data collection, conversion, storage, alarm, control and other functions, and with the monitoring center via wireless channel Microcomputer data communications. According to the order of the respective control center system self-test, data transfer, control output and other tasks.
  sensors and instrumentation: a PLC signal to monitor on-site “Eyes”, the scene all the signals are subject to change through the sensor and the instrument can output standard signals, the terminal has been accepted by PLC. System is mainly measuring voltage, current, level, pressure, flow and power consumption parameters.

Well lose control of water pumps l manual control. Operator on the basis of the input pump clear water tank level to start and stop operation.
l control. PLC under the clear water tank level and the input pump start and stop the water level of the input pump in the automatic mode to start and stop operation.
Third, on-site PLC terminal
  scene PLC control terminal is the industrial field and a bridge link between the monitoring center, on the one hand it is acquiring the instruments, transmitters, signal equipment, such as running, on the other hand it communication with the monitoring center, the implementation of the order. On-site terminal generally unattended. Therefore, the terminal s performance and quality of a great impact on system reliability. After full argument, use of Siemens S7-200 series PLC to the terminal site has a high cost performance, it has a small, easy to expand, excellent performance characteristics, is ideal for small-scale on-site monitoring.
  1, PLC hardware design
  site require monitoring and control of a terminal input signal switch, the switch output signal path analog input signal. Therefore, we choose the basic unit of S7-212, analog input expansion module (EM231), analog output expansion module (EM232). Meet site requirements.
  2, communication interface
  from the station PLC and radio communications: S7-214PLC basic unit of a RS-485 interface with the wireless channel for data transmission machine (power, data radio) is connected, we have designed a dedicated RS-485 Interface Modem and the use of photoelectric isolation technology, so the two are completely independent in the electrical and avoid mutual interference, as when data transfer plane firing RTS signal, the RS-485 interface, not Tigong RTS signal, two methods to resolve this issue. First, the Wireless Modem PLC launch information generated under the RTS signal, which requires the Modem must be intelligent, while PLC required before sending the message first and Modem communications, let the output signals RTS and RTS have been generated to send back information, then PLC and then send the site information. Second, the use of a PLC I / O output point, RTS signal generated by the PLC is connected before sending information to the point, the control data transmission machine launch, after a period of delay (the establishment of the carrier radio time), then send information. The latter method is simple, practical, better solve the problem of wireless communication interface. The news of two, currently incolor = red> 1????1   2