The input power is protected by diode D1, so if you happen to connect the power incorrectly it shouldn’t blow up the circuit. I’ve marked the image below to indicate positive and negative leads. For light bulbs this doesn’t matter, but in general you should pay attention to polarity. ![]() For example, if your device works with 12V DC and draws 500mA when turned on, the transistor’s maximum voltage and current ratings must be at least 12V DC and 500mA.Ĭaution: Since DC has polarity, you have to distinguish between the positive and negative pins. Voila, I have a web-controlled light bulb array! Maybe use it to light up Halloween pumpkins?Ĭaution: Your transistors must have sufficient current and voltage ratings to drive the DC output. I then bought a number 12VDC 4-Watt landscape light bulbs and connected them to terminal blocks. The replacement is very simple because the triac pinouts match the transistors exactly, so they are inserted the same way into the PCB. Here I replaced the triacs with MPSA14 darlington transistors in order to switch DC components. If you have thoughts and suggestions, be sure to drop me a line. I’ve also included a couple of demonstrations that I quickly put up together as proofs of concept. The diagrams below show how various devices can be connected and switched by controller, allowing them to be scheduled from the same web interface. This provides an easy and safe way to control power line devices. Alternatively, you can use the controller in conjunction with an RF transmitter to send switch signals to a remote power socket. If you need to switch high-voltage devices, such as power line devices, you can use the controller to switch 24VAC relays, and the relays will in turn control high-voltage devices. The limit is due to the fact that the controller uses a single power supply design, and the switching regulator’s maximum input voltage is 40VDC.īesides, the triacs can be replaced by MOSFETs/transistors to switch DC devices, as long as the DC input is below 40VDC. ![]() The on-board triacs can be used to switch other AC devices, so long as the voltage required by these devices fall below 28VAC. In essence it is really a general-purpose development board that has a microcontroller, Ethernet controller, LCD, buttons, output drivers and terminal blocks to control devices. With some modifications, OpenSprinkler can be used to switch other electronic devices via the same web interface. It will then enter a self-test mode where each station is turned on for 5 seconds.Check this blog post for a simple way to use OpenSprinkler to control remote power sockets. Instead, it has a self-test mode, which is activated by *holding* B1 while powering up the controller. – The software shipped with v1.2u does not have manual mode. the port you connected to OpenSprinkler) should light up. However, the LED on the router’s port (i.e. – The two built-in LEDs on the RJ45 jack are not internally connected to the ENC28J controller, so you won’t see them light up. For example, on my router, the client IPs are all in the range 192.168.1.1xx, and the gateway ip is 192.168.1.66. If you are unsure, check the router’s configuration page. Note that the ips must be set correctly according to your router configuration. Finally, *hold* B3 will activate the settings. Next, set the static ip and gateway ip according to your local network. Then click B3 to navigate to ‘Use DHCP’ option, and press B1 or B2 to set it to ‘No’. ![]() To do so, *hold* B3 while powering up the controller, you will enter Option Setup. – I suggest that you use static IP first.
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