How touch-sensitive timer switch to extend battery life

Some type of cordless optical mouse uses two AA alkaline.It does not switch. When not in use, it will automatically switch the light source dell inspiron 14 battery low duty cycle switching to reduce energy consumption. However, this function will always run out of power, so that the mouse can not be used. Problem solution is to add a switch, it can automatically after a predetermined time, disconnect the battery. This method does not require the disassembly or other types of changes. This example describes the design to the production of two distinct methods, which use a touch timer which can be added dell inspiron 17 battery to a lot of work with the battery , but can not accidentally turn it off. 

Figure 1 circuit, said analog switch realization. Figure 2 and Figure 3 is a digital realization. This concept is the negative terminal of the battery clip and battery in a contact between the double-sided pcb 30mil (PCB) (Chart A). Q3 is a low-threshold MOS transistor that connects the two sides of the band dell inspiron 1440 battery as a switching element (Figure 1). C1 is ceramic chip capacitors 0603×7r, R1 is a resistance of 0603 chip. Near the upper edge of T3 and all related components to install. b is a thin, narrow strips of copper, only the positive terminal and the second series. With a thin flexible wire to connect to the circuit. Touch points C and D by the copper tape self-adhesive form a short, copper mounted on the outside of the battery dell inspiron 1750 battery compartment. Soft c and d of thin wire to connect to the circuit. 

Q1, Q2, and C1 to form a monostable flip-flop. When switch is closed, C1 does not load, Q1 and Q2 are closed. When touched with the fingers while C and D, the current through the fingers will be sufficient to level C1 Q2 limit. Q2 and Q1 are conducting, Q1 and C1 through your fingers dell inspiron 14 battery release driver. Thus, q2 level gate voltage near the voltage of the battery. After removing the finger in the door of the inner protective T2 (Figure Zener diode) Q2 gate leakage current produces a voltage in the voltage decreases slowly until it reaches approximately 1.3V threshold level. Q2 end of turn, and with Q1 as a recovery action, fast turn-off Q3.

Switch remains off until another touch c and d. e is a contact option, with C and D. If you touch E and D, the is off. C1 0.01f, or a delay of about one hour. Because the gate leakage is the number of magnitude Pian, you have to solder on the circuit of washing detergent, then a drop of wax dell inspiron 17 battery or epoxy resin to cover. 

In some cases, you can adjust the schedule switch. The circuit of Figure 2 shows such an option. It uses a SOT-23 package, the micro controller. Code Listing 1 contains a touch-activated timer. a, b, c, d the same as in Figure 1. When the switch is closed, the microcontroller is in sleep mode pic10f200t, consume almost no power. When you simultaneously touch contacts c and d, the PIN1 IC1 excited, start time microcontroller pins 1 remains high. In the 0.5s, the ringtone to send a short sound. Then the buzzer to send 0.5s interval of two, three and four short blasts. Listen to the sound immediately after the publication of all contacts dell inspiron 1440 battery c and D, respectively, the switch can be set to 30 seconds, 30 minutes, 4:00 and 8:00. Working time can be arbitrarily chosen, you can modify the code in Listing 1 code to meet their own applications. J1 jumper is optional. If you leave open c J1 touch, and D to the close. Will J1 short to close this option, and switching time is only until the end of the pre-closing. As is the case with the simulation to achieve, can all the components except the buzzer installed in the outer edge of A. Piezoelectric buzzer is a small 4kHz resonant frequency, easily in the battery compartment. 

In some cases, can be exposed in the back of the battery negative contacts. The circuit of Figure 3 to solve this problem. It is essentially the same circuit in Figure 2, but will be a series to the cathode, and b connected to the negative battery. PMOS pipe as switches, the program micro-controller dell inspiron 1750 battery should be revised to provide a record low Q1. Code Listing 1, note for note in Figure 2 or Figure 3, where the option number online program.