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How to build a hybrid solar/wind energy harvester?

Webshop opening

Sales promotion in Our webshop! 1. The square meter 2 blade H-rotor   Includes: 12V generator 2 wing hub 2 darrieus blades We recommend the 2 wing economical H-rotor, and although in theory this is not 100% self-starting – as can be proven in a wind tunnel – it always starts on all the real […]

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Green4 power controller: remote control with Raspberry Pi

As long as real-time control and fail-safe operation is not a strict requirement, the GUI or another PC application could be used to control the Green4 via our rs232 serial protocol. The target software simply executes what is being demanded by the application, and returns its measurements at regular intervals. Various – but mainly prototyping […]

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Green4 serial test protocol and GUI

Introduction For most embedded projects it is good practice to have basic tooling for testing I/Os. I/O primitives such as ‘read gpio’, ‘set pwm duty cycle’, ‘read adc’, not only allow engineers to verify hardware and software drivers, it might also be very helpful to service and support people. Serial protocol In our project we […]

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3D printing of enclosures

Having the correct and proper enclosures, is a mechanical (and also a marketing) problem many electronics projects suffer from. It is also related to anticipated sales numbers. For big numbers, a custom enclosure which is produced with an injection molding machine is not a big cost since the financial burden can be divided and written […]

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Progress update

Time for another update. The Green4 project is progressing steadily. In the last few months, we have been busy preparing the Green4 prototypes. Test software has been developed which is already very usable, but it is still in a state of flux as we try to determine which advanced features must be made available to […]

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Embedding a Basic interpreter

The green4 stm32 cortex m3 microprocessor we selected is – according to today’s standards – a rather small microprocessor in Flash (128KB) and RAM (8KB). why an interpreter The Green4 device is running control software on top of FreeRTOS, with a couple of drivers, and exposes a communication and an information protocol. We think our […]

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Green4 charge controller: wiring diagrams part 2

Wiring diagram: wind turbine to dump load In contrast to solar panels, a wind turbine can’t be disconnected in case it generates too much power. We need to brake it by attaching a load to it. However, wind power can’t always flow through the charge controller: high volts and/or amps might damage the internal circuitry […]

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Green4 charge controller: wiring diagrams part 1

Introduction Instead of endlessly listing requirements and specifications, we prefer to demonstrate the architecture of our Green4 charge controller by means of wiring diagrams and other illustrations. The Green4 is designed to be a versatile device that enables you to evaluate different charge controller architectures. Call it a charge controller emulator. There are several reasons […]

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DC motor control with the mosfet switch board

Although, there is no such thing as a general purpose mosfet switch board because of the wide variations in application specific load (resistive, capacitive, inductive or mixed) characteristics, we were able to investigate and demonstrate DC motor control with our prototype board. Then, we performed the same tests on the energy2switch board. The brushed DC […]

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Current limiting with PWM

For particular applications, such as our energy harvester or at least the battery charger part of it, the ability to control the current is an essential property. We must emphasize that the presented method will limit the average current; the instantaneous current might be higher. So, although it works well for our particular application, it […]

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