The maximum tolerable current of a 5-mm LED is about 25 mA.
#INSTALL STM8 COSMIC TOOL CHAIN SERIES#
Therefore, we cannot assign a fixed limiting series resistor for all circumstances. The characteristics of LEDs vary from manufacturer to manufacturer. In each part, I have put three LEDs in series that are connected to the +9-V rail (Figure 2). R1 to R26 resistors are used to limit the LEDs’ current. R27 is a pull-up resistor and C8 reduces the possible pushbutton debouncing noises. SW1 is a tactile pushbutton that is used to switch between flasher programs. The gate pins of both MOSFETs have been pulled down using 4.7K resistors to avoid unwanted triggering (R13, R14). IC2 and IC3 are logic N-Channel SMD MOSFETs that are used to turn on/off the LEDs. This pin must be connected to the SWIM pin of the programmer/debugger. It is a high-speed link between the MCU and the programmer/debugger. It stands for the Single-Wire Interface Module. IC1 MCU is programmed using a single SWIM wire. C7 is a supplementary filtering capacitor for the IC1. REG2 is used to convert 9 V to 5 V to supply the STM8s001 MCU (IC1). The SDS1104X-E oscilloscope introduced a nice bode plot feature that can perform this useful calculation. The best way to examine the behavior of this filter (or other filter types) is to perform a practical measurement.
It helps to reduce the noises even further because this device might be used continuously in a noisy environment such as a vehicle.
The output of the REG1 is handled to a first-order RC filter (R28 and C5). C4 and C6 are used to reduce the regulator’s output noises. It is used to stabilize the voltage at 9 V. Then the voltage is handled to the 78M09 (REG1) regulator. C2 and C3 are used to reduce the input voltage noises. Let’s start the analysis from the power supply unit. The heart of this circuit is an STM8S001 microcontroller.įigure 1: Schematic diagram of the programmable police LED flasher Circuit analysisįigure 1 shows the schematic diagram of the device. In this article, we are going to build a programmable police LED flasher device that can be used for vehicles, motorcycles, and bicycles. This MCU is offered in a small SO8N package. It is referred to as a low-density device in the STM8S microcontroller family.
#INSTALL STM8 COSMIC TOOL CHAIN PLUS#
The STM8S001J3 is an 8-bit microcontroller that offers 8 Kbytes of Flash program memory, plus an integrated true data EEPROM.
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