Keyestudio LED dot matrix display module connects four 8 * 8 dot matrix. Line selection is chosen by 4-16 decoder which consists of two 74HC138, and as for the strobe line, LED anode will be connected. Column output consists of two 74HC595 cascades, which can convert serial data into parallel data through the SPI signal.
Keyestudio BH1750FVI digital light intensity module is a digital light intensity sensor integrated circuit used for two-wire serial bus interface. It uses the light intensity data collected by module to adjust the brightness of LCD and keyboard backlight. The module resolution can detect a wide range of light intensity changes.
The converter is the key to easy implementation of the A4988. As long as the "step" input carries in a pulse, you can drive the motor to produce micro-step. There is no need for phase sequence tables, high frequency control lines or complex interface programming. The A4988 interface is ideal for complex microprocessors that are not available or overloaded.
The keyestudio power amplifier module integrates an adjustable potentiometer, a speaker, an audio amplifier 8002B chip and a 3pin header interface.
It can amplify the small audio signal output, about 8.5 times magnification, and can play it out via a small power speaker.