Solder about 4" to 6" of wires to your temperature sensor. Test that the fan turns on and the LED's brightness indicate the temperature.
#Power supply for lacie external hard drive code#
If you have Atmel Studio, open the project, build and flash to your ATtiny85 chip.Īlternatively, you can transfer the code in main.c, and the files ds18b20.c and ds18b20.h to an Arduino IDE project, compile and flash to your chip.įollow the schematic and breadboard the fan controller parts.
The fan code is in an Atmel Studio project. This will also be the when the LED first turns on and be the dimmest.Īdjust MAX_TEMPERATURE in main.c to the temperature you want the LED to start blinking. The LED would act as a temperature indicator by its brightness and then blink if the unit is past a certain temperature.ĭownload the PsuFanController source code from GitHub.Īdjust FAN_ON_TEMPERATURE in main.c to the temperature you want the fan to turn on. Since the PWM code was in place, I thought why not just hook up an LED in the fan's place.
#Power supply for lacie external hard drive full#
The fan is pretty quiet at full speed so I decided to just have the fan either be fully on or off. Initially, the fan was also PWM speed controlled. I didn't want the fan running constantly so I used an ATtiny with a DS18B20 temperature sensor to turn the fan on and off. I wanted a fan in the power supply unit just in case things got hot. *** Thank you to jakane for pointing out the fuse to use in the comments.
So make sure you measure, double check, then test fit stuff before finishing things up. I made the mistake of building my first power supply with 2.1mm only to be bummed out at the very end when the plugs didn't fit. ** Make sure to measure the DC socket's center pin of your external hard drives enclosure. Whichever you use for your AVR programmer.
8 * 5.5x2.5mm DC Power Female Jack Panel Mount**.Always unplug the power cable before working on it. Please take care with this project as it involves working with mains power. The LED was really an after thought but I didn't want to waste more filament and 13 hours of printing so I just stuck my LED close to the vents. Currently missing from the model is a nice place holder for the temperature LED indicator. The 3d model is up on Thingiverse for you to modify. I also made a 3d printed enclosure for this power supply for those that want to print their own enclosure. For me, the fan was on maybe 10% of the time so there was not much power consumption. I measured under 1 milliamps while the microcontroller slept. I know that's not the most efficient way since I'm chaining switching power supplies but the ATtiny sips power. I use a DC step-down buck regulator to power the fan controller. The temperature controlled fan only turns on when the temperature gets too hot so you don't have a noisy fan whirling all the time. The simple LED temperature indicator indicates the temperature of the unit based on brightness. The ammeter lets you monitor current draw so you do not inadvertently connect too many devices. Fuses are always good so you don't burn things out. This DIY multi-external hard drive power supply is fuse protected at the mains socket, has an LCD ammeter to monitor current draw, simple LED temperature indicator, and a temperature controlled fan. We could just get a 12V power supply that can provide more than enough wattage for the amount of drives in use and slap on a bunch of DC jacks, but we can do a bit better than that and add few features (but not too much where the project becomes unwieldy). One poster mentioned none are made because that would be a single point of failure but another rebuked that by saying a desktop PSU is essentially what you are looking for but not out of the box useable for our purposes. Most of the search results were people asking the same question. I looked online for an out of the box solution but did not come across any that fit my needs. Do you use a bunch of 3.5" sized external hard drives that have their own wall wart power supplies? Don't you just hate that the wall warts take up soooooo much space on your power strip? Me too! That's why I made a 12V power supply to power my external hard drives.
0 kommentar(er)
