MCS51 Controller Library 1.DS1307.h // For DS1307 with i2c Bus 2.I2C51.h // For i2c bus 3.lcd4bit.h // For LCD4bit 4.lcd8bit.h // For LCD8bit 5.MCP3208.h // For MCP3208 with SPI Bus 6.PWM.h // For Internal MCS51 PWM Mode 7.Serial.h

this program has many parts and fully working,based on MCS51. Hand made PWM and wave forms for dimmer like output.it also drives ISD audio chip.