- Above image link
- One wire protocol is serial communication protocol
- Its developed by Dallas Semiconductor.
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A touch keypad is an input device that allows users to interact with electronic devices by touching designated areas on its surface. It typically consists of a panel with sensitive touch sensors beneath, capable of detecting the presence and location of touch inputs. Touch keypads are commonly used in various electronic devices such as smartphones, tablets, ATMs, point-of-sale terminals, and household appliances like microwave ovens and washing machines. They offer advantages like sleek design, ease of use, and versatility in terms of layout and functionality.
Read more: Embedded Interface – Touch KeypadHere is the Specifications
Feature | Description |
---|---|
On board 8 key TTP226 capacitive touch induction IC. | Allows for capacitive touch sensing with 8 keys. |
On board 8-way level indicator. | Features an 8-way level indicator on board. |
Working voltage | 2.4 V to 2.4 V |
Modules | Allows for setting output mode, key output mode, the longest time, and fast/low power output. |
PCB board size | Dimensions: 47.5 mm (width) x 46 mm (height). |
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
These are either normally on (Push-to-break0, or normally off(Push-to-make). They can be latched, So they stay pressed down after you remove your finger, like the switches on a torch.
These are magnetically activated
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
Summary of LED Colors and Common Chemistries
Color | Wavelength | Materials |
Amber | 605-620 nm | Gallium arsenide phosphide, Aluminum gallium indium phosphide |
Blue | 430-505 nm | IInGaN (Indium Gallium Nitride), Gallium nitride, Silicon carbide, Sapphire, Zinc selenide |
Green | 550-570 nm | Aluminum gallium phosphide, Gallium nitride |
Infra-Red | 850-940 nm | Gallium arsenide, AL GaAs (Aluminum Gallium Arsenide) |
Red | 630-660 nm | AL GaAs (Aluminum Gallium Arsenide), Gallium arsenide phosphide, Gallium phosphide |
Ultraviolet | 370-400 nm | Indium gallium nitride, Aluminum gallium nitride |
Violet | 410-420nm | |
Yellow | 585-595 nm | Aluminum gallium phosphide, Gallium arsenide phosphide, Gallium phosphide |
WaveLenth | LED APPLICATION |
410nm-420nm(violet) | Skin therapy |
430nm-470nm(blue) | Dental curing instrument |
470nm(blue) | White LED’s using phosphor, blue for RGB white |
520nm-530nm(green) | Green traffic signal lights, amber for RGBA white lights |
580nm-590nm(amber) | Red signal lights, red for RGBA white lights |
630nm-640nm(red) | Blood oximetry |
660nm(deep red) | Skin therapy |
680nm(deep red) | Night vision illuminators and beacons for use with night vision goggles or CCD’S |
800nm-850nm(near IR) | Photo electric controls |
940nm(near IR) | Convert illumination CCD based systems |
Reference : http://www.goldwynled.com/knowledge-bank/led-basics
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In this article we are discussing Embedded Interface – PCF8574 and PCF8574A I/O Expender.
The PCF8574 device provides general-purpose remote I/O expansion for most micro controllers
families by way of the I2C interface [serial clock(SCL), serial data (SDA)]. 8-bit 2.5- to 5.5-V I2C/SMBus I/O expander with interrupt
The device features an 8-bit quasi-bidirectional I/O port (P0–P7), including latched outputs with high current drive capability for directly driving LEDs. Each quasi-bidirectional I/O can be used as an input or output without the use of a data-direction control signal. At power on, the I/Os are high. In this mode,
only a current source to VCC is active.
void Lcd4_Clear() { Lcd4_Cmd(0x00); Lcd4_Cmd(0x01); } // clear screen 0x01 void Lcd4_DisplayOFF_BlinkON_CursorON() { Lcd4_Cmd(0x00); Lcd4_Cmd(0x0B); } // 0x0B void Lcd4_DisplayON_BlinkOFF_CursorOFF() { Lcd4_Cmd(0x00); Lcd4_Cmd(0x0C); } // 0x0C void Lcd4_DisplayON_BlinkOFF_CursorON() { Lcd4_Cmd(0x00); Lcd4_Cmd(0x0D); } // 0x0C void Lcd4_DisplayON_BlinkON_CursorOFF() { Lcd4_Cmd(0x00); Lcd4_Cmd(0x0E); } // 0x0E //void Lcd4_Shift_Left() { Lcd4_Cmd(0x01); Lcd4_Cmd(0x08); } // 0x18 //void Lcd4_Shift_Right() { Lcd4_Cmd(0x01); Lcd4_Cmd(0x0C); } // 0x1C
Embedded Interface 7 Segment (Add Soon) |
Embedded Interface ADC (Add Soon) |
Embedded Interface Button (Add Soon) |
Embedded Interface EEPROM (Add Soon) |
Embedded Interface LCD (Add Soon) |
Embedded Interface LCD HD44780 (Add Soon) |
Embedded Interface LED |
Embedded Interface MCP23017 |
Embedded Interface Motor (Add Soon) |
Embedded Interface PCF8574 and PCF8574A |
Embedded Interface RTC (Add Soon) |
Embedded Interface Switch |
Embedded Interface Touch Kypad |
Embedded Interface RGB LED (Add Soon) |
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