sure once you have left almost no disk space hard and do not know at a glance where you are losing.
There is a useful tool to sea to view the directories or files that take up more space on your hard disk. WinDirStat is called and takes a whopping 600 kas.
I shows the percentage of disk usage by directory, so now you can know where to start scratching.
If you want to download, is open source, you can do at:
My project for this month is a universal battery charger, that is, load all types of batteries (NiCd, NiMh, LiPo (or LiPoly) SLA, Lithium, etc), all intelligently controlled by the PIC 16F877A to ensure care for the life of the battery and obtain maximum efficiency.
source I'm doing for now, I show you a picture preview:
Analysis of charge / discharge of NiCd and NiMH batteries
Loading is the process of restoring the original capacity battery discharged. To achieve a longer life, it must bear the appropriate method.
Various methods are used to charge rechargeable cells:
1. Fast charge current: 1CmA (fast charge temperature: 0 C to 40 C). To gain control and stop the fast charge, we recommend charging over but less than 1CmA 0.5CmA. Battery charging over 1CmA can cause it to activate the safety vent for increased battery internal pressure, causing leakage of electrolytes. When the battery temperature is detected by a thermistor or other sensor, and its temperature is below 0 C or above 40 C at the beginning of the load, must perform a floating charge, rather than a fast charge. A quick charge should be stopped when any of the values \u200b\u200bdescribed below reaches the designated level:
upper voltage limit control : Approx. 1.8V/celda. This method is changed to a floating charge if the battery voltage reaches approximately 1.8V/celda due to problems or malfunction of some kind.
value dV / dt (or delta peak cut) : 5 to 10mV/celda. When the battery voltage drops from its peak 5 to 10mV/celda for fast charging is to be stopped, and the charging method should be changed to float.
value dT / dt (or cutting temperature) : 1 to 2 C / min. When an increase in battery temperature per unit time is detected in the thermistor or other temperature sensor for fast charging, and the temperature rise is detected by the sensor, fast charging should be stopped and charging method changed to float.
Timeout: 90 minutes.
2. For charging excessively discharged, first apply a floating charge current to flow, and then proceed with rapid charging once the battery voltage rose. initial fast charge voltage: Approx. 0.8V/celda with a current of 0.2 ~ 0.3 MAC.
Requirements:
initial Wait 10 minutes. This prevents detection circuitry dV / dt is triggered by the specified time at the beginning of the fast charge. However, the detection dT / dt can be active in this period. This is necessary for batteries that were left unloaded for a long time or were too loaded, etc.. The initial wait is necessary to prevent the load stops (to prevent malfunctions) due to pseudo dV / dt. Current
floating or maintenance : 0.033 to 0.05 MAC. When the current flow is high, the battery temperature increases, causing the battery characteristics deteriorate.
Fast-charge time: 60 minutes.
Total time: 10 to 20 hours. Overloading a battery NiXX, even floating charge or maintenance, causing deterioration in the characteristics of the batteries. To prevent overloading the floating charge or any other method, you must provide a timer to regulate the total charge time.
Analysis of charge / discharge of SLA (Sealed Lead-Acid) Lead-Acid
Unlike NiXX batteries, these batteries are charged to fixed voltages instead fixed current.
Charging Method: 1. Check the battery. 2. If OK, start the constant current charging capacidad/10. 3. When the voltage reaches 2.55V/celda switch to constant voltage charging 2.45V/celda. 4. If the current falls below capacidad/20 then switch to float charge. 5. Upload 2.25V/celda shaped floating indefinitely (recommended maximum 20 hours).
Requirements:
An SLA battery should not be downloaded unless 1.5V/celda. maximum battery voltage is 3V/celda SLA.
Analysis of charge / discharge battery LiPO (lithium polymer) and LiIon (lithium ion)
Charging Method: 1. 1C to constant current until the voltage reaches the 4.2V/celda. 2. 4.2V/celda constant current until the current drops to the capacity / 15. 3. Floating load capacity / 30 for 30 minutes.
Requirements: a LiPo battery should not be downloaded unless 2.5V/celda. Maximum voltage LiPO battery (lithium polymer) is 4.5V/celda.
Based on these recommendations, I designed the magazine with the following characteristics:
Default Description Maximum charge current: 0 to 5A Maximum discharge current: 440mA (I = V / R -> R = 12/27 -> I = 0.444mA) Modes: 0: NiMh, 1: SLA, 2 : NiCd, 3: LiPo, 4: LiIon cells Capacity: 3000mAh Number of cells: (1 to 19) 6
This is the PCB design The Fluf friend uControl forum ( www.ucontrol.com.ar ), very soon we will also publish PCBWizard design formats so they can customize it to taste.
After asking permission for publication here are photos of his excellent work:
For LCD we give two versions, and adapts to 16x1 or 14x1, if I had one of 7x2
