Miniature Real-time Controller


Posted on Sep 28, 2012

This is my long history the device that controls my home`s night light, air-conditioner,etc. The device is a Miniature Real-time Controller. The circuit uses only three chips, a 89C2051, DS275(or MAX232), and 74LS07 open collector driver. The scheduler for time on/off of 6-channel output can be made by downloading from PC and saved into onchip RAM. Each output provides a 20mA sinking suitable for driving a homemade opto-triac or big solid-state relay for heavy load.


Miniature Real-time Controller
Click here to download the full size of the above Circuit.

A circuit diagram of the Miniature Real-time Controller is shown in Figure 1. A 89C2051 with a low-cost X-tal 3.579MHz runs timer6.hex. The 6-channel output is P1.2 to P1.7 driving with sink current. A 74LS07 open collector provides approx. max 20mA @12V




Leave Comment

characters left:

New Circuits

.

 


Popular Circuits

3.6 Volt Lithium Ion Battery Charger (PIC12F675)
Automatic Level Control Signal Circuit
Daft Punk Coffee Table 5x5 LED Matrix using an Arduino
Ticking Bomb circuit diagram
1.2GHz Voltage Controlled Oscillator With Linear Modulation
Metal Detector DIY
BCD seven sections of nixie tubes reveal the decoder circuit
removable memory card
Low pass filter circuit 10KHz using uA741
IR Widget
Subcutaneous Transmitter
Capacitive level measuring circuit



Top