Category Archives for Projects

Swiss Pi Extensions – DC Motor Controller

The DC motor controller board (Figure 3) can drive two DC motors independently, with a maximum operating voltage of 40 V and a maximum current of 5 A. The output stage of this board consists of two TLE5206-2 MOSFET H-bridge … Continue reading

12. July 2018 by sam
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Swiss Pi Extensions – Eight-channel digital input board

This extension provides eight galvanically isolated inputs with an input volt age range of 5 to 45 V (see Figure 2). Galvanic isolation is provided by optocouplers. On the input side the current sources built around the BC547 transistors keep … Continue reading

12. July 2018 by sam
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Swiss Pi Extensions – Eight-channel relay board

The eight-channel relay board (Figure 1) uses relays from the Omron G5Q series. Sharp S202S02 solid-state relays can also be mounted on the board in place of conventional relays. Unfortunately those relays are no longer being made, but for now … Continue reading

12. July 2018 by sam
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PI-OBD: The Hardware

The PI-OBD-HAT [10] from Diamex turns a Raspberry Pi into an OBD2 diagnostics adapter. Fitted with the 7” touch screen you have a handy and powerful stand-alone diagnostic tool for vehicles with an OBD2 interface. The RPi and its display … Continue reading

12. July 2018 by sam
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IoT Gateway – The Gateway

The gateway consists of an Arduino, an RFM69 module and an W5100 Ethernet module. Figure 5 shows the schematic diagram. The gateway also uses an Arduino operating at 3.3 V. On the gateway the SPI bus is shared by the … Continue reading

12. July 2018 by sam
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IoT Gateway – End Nodes

The end nodes are based on Arduino boards. The following conditions and constraints are taken into account in the design: • The RFM69 module has an operating voltage of 3.3 V, and the maximum permissible voltage on its inputs is … Continue reading

12. July 2018 by sam
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IoT Gateway – The Protocol

Various functions are defined for the end nodes. They include sensors for temperature and humidity, switches, PIR motion detectors for input, and relays and LC displays for output. End nodes can autonomously transmit measurement data at regular intervals. This measurement … Continue reading

12. July 2018 by sam
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IoT Gateway and Wireless Nodes

For the end nodes, which means the sensors and actuators, you ideally want reasonably affordable devices which are also energy efficient. The central controller obviously has to support standard network protocols, including TCP/IP. That is why the author opted for … Continue reading

12. July 2018 by sam
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IoT Shield for Arduino

The board offers several expedient functions: • a variable voltage source for biasing or powering sensors; • an analogue input with adjustable gain for small signals; • a current and voltage limited input for detecting a high voltage; • six … Continue reading

12. July 2018 by sam
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LED Stairway Lighting – One controller for a whole bunch of LEDs

This job can be performed by the venerable ULN2003 chip which comes in a DIP package and contains eight Darlington-transistor drivers able to switch up to 50 V at 500 mA, much more than we need in this application. The … Continue reading

12. July 2018 by sam
Categories: Projects | Comments Off on LED Stairway Lighting – One controller for a whole bunch of LEDs

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