17 December, 2016

Installation and improvements over an Hephestos Prusa i3 3D Printer from BQ


Those who follow me will have seen that I have uploaded some videos with the assembly of the i3 Prusa BQ, plus reducing vibration and the last has been adding LED light, adapting for printing flexible filament and isolating the extruder with silicone (spanish voice):


15 December, 2016

Improving cooling a powerful notebook graphics with a transistor and Arduino

Laptops that come with powerful graphics have an usually badly designed thermal control; This is the case of my dear Acer 5930G (already I spoke above ) wearing a removable Geforce graphics card.
Engineers Acer believed it was enough to regulate the fan with the processor temperature, since the sink joins both, but the graphics consume more, which can reach 70 easily while the CPU is 40 and the fan medium gas.
We'll see how we regulate the fan directly 5V , depending on the temperature of the area that interests us, with the advantage of being able to use any fan that can be coupled to our team, plus you can customize the level of cooling in the Arduino code. 

The result : I got him down more than 20 to the graph regarding the regulation of factory, from 70 to about 45 ° C at rest. And in 90 games at maximum 70 ° C. You hear more, because almost constantly is 100% , but if that win in durability, I welcome the resulting hiss. Another advantage is that by taking the power from the USB port, turn it off when no temperature peaks but still cooling off while connected to the grid, until it cools completely and stops. 

Materials Needed:
- Chip ATtiny85 
- Transistor NPN 50V typical and 5Vgs ( 2N4401 I used myself). 
- Capacitor 220uF 6V and min. 
- Diode 5V and minimum hold 200mAh. 
- Tubing.




13 December, 2016

Drivers for Windows 10 ATI RV370 (X300)


Here you have direct download, without advertising, of drivers that work for this card in Windows 10 (64 - bit and I think also 32 bits).
If gives you an error in the installation, you can also try to install them manually (by going to Device Manager Update Driver, select it manually).

I've gone crazy looking for them ... and no more than advertising on pages that may have (Ati no longer supports it) so if I save the headache to someone ... great.

Reusing power sources to power devices of different voltages: voltage converters

42V DC Power 19V 2A regulated DC to charge a laptop that spends 3A
In this post we will see how to feed these appliances we have at home, whose power supplies had stopped working and left, forgotten, in a drawer.
For example, that portable power supply can have a second life and continue feeding any device that requires a power exceeding the capacity (watts) of the transformer. While we maintain the amps equal or exceeding the needings by the apparatus we want to power, we just have to make sure that the voltage output is the same or little less of your device needs.
If for example we need an  e-bike charger, or need a charger of a given voltage, we can adapt economically the output voltage: This is where the boosters and converters come into play modifying voltage DC to DC.

08 December, 2016

Improving the Ebike with Arduino to monitorize battery and other info 1/2


It is the second time it happens; I pick up the bike, and after the trip to work, the ebike left me without power in the middle of a slope... with the hassle of having to carry their 30 kgs. on a slopes over 14% (and the damage it does to the battery the depth discharge, fortunately are pretty well LiFePo that support this). 

I have no charging indicator (the handle that provided me is to 48V) to calculate if you have enough power for 4 km I have to do, and also the LiFePo4 have a very small voltage variation between 20% and 80% of capacity (between 3,15V and 3,35V), which is easily neglected. And make it load every day is not practical or the best for the battery (ideally recharge when you reach the 20% to maximize battery life). And the battery charge indicators seem to me too "greedy" energy. So...

A solution for every need ...



01/09/17: In the end I finished using a Nano and MPU-6050 accelerometer for burglar alarm functions and voltage indicator, in the 2/2 post from january 2017 you can see the details.