Greetings to all readers of the "DIY or DIY" section on Habr! Today's article will be about the touch switch on the TTP223 chip | . The switch is powered by the nRF52832 microcontroller | , the YJ-17103 module with a printed antenna and a connector for an external antenna MHF4 is used. The touch switch is powered by CR2430 or CR2450 batteries. Consumption in transmission mode is no more than 8 mA, in sleep mode no more than 6 μA.
Like all previous projects, this one is also an Arduino project, the program is written in the Arduino IDE. The software implementation of the device is based on the Mysensors | , in mysensors. English Community Forum - , Russian-language community forum -
(For those wishing to study - , , , , | for those who want to help) in project development — )
The touch switch board was developed in the Diptreys program, taking into account the subsequent production using the Laser Ironing Technology (LUT) method. The board was designed in dimensions of 60x60mm (standard glass panel has dimensions of 80x80mm). The circuit was printed out on the pages of the Antenna magazine and transferred with a Bosch iron with the “Len” setting (maximum power) to a double-sided foil-coated fiberglass board 1.5mm, 35μm (for lack of another).
Etching was carried out with a solution of ferric chloride, previously prepared in proportions of 1.5 teaspoons per 250 ml of warm water. The process took 15 minutes.
The vias and battery holder holes were drilled with a DREMEL 3000 mini drill mounted on a DREMEL 220 drilling stand. The vias were drilled with a 0,4mm drill, the battery holder holes with a 1,1mm drill. Trimming along the borders of the board was performed with the same mini-drill with a DREMEL 540 nozzle (Cutting wheel d = 32.0mm). Trimming was done in a respirator.
The tinning of the etched board was done with Rose alloy, in an aqueous solution (1 teaspoon of crystallized citric acid per 300 ml of water).
The soldering process took about an hour, most of the time was spent on soldering the wire (tinned, 0.4 mm in diameter) in the holes for vias.
The board was washed with an aerosol cleaner FLUX OFF.
The development of the device case was carried out in a three-dimensional computer-aided design editor. Case dimensions 78,5mm X 78,5mm X 12mm.
The finished model of the body and battery cover was saved in STL format, then it was necessary to prepare these models for printing on an SLA printer (adding supports, orientation). At this stage, there was a small problem, since the printable area of \u45b\u5bconsumer SLA printers is small. The model of the device body in the most optimal position in relation to the printing time did not fit into the dimensions of the print area. When placing the model at 50 degrees, it also gave a disappointing result, the weight of the support was equal to the weight of the hull model. It was decided to print the model vertically, making support on one of the front sides, which agreed in advance with the post-processing fact. The case took 40 hours to print with a layer setting of XNUMX microns. Next, processing was performed using very fine-grained sandpaper (I won’t write the number, because I don’t know :)). The battery cover took XNUMX minutes to print.
Glass panels from Aliexpress are sold with a plastic frame already glued, there were no problems with removing the frame. I removed the pre-heated glass panel with a conventional hair dryer.
The diffuser for the led backlight was made of double-sided tape with 3M 9088-200 acrylic adhesive. For fluorescent illumination, there were several materials to choose from, Chinese adhesive tape and adhesive paper cut into tapes by the domestic company Luminophor. The choice was made in favor of a domestic manufacturer, according to my feelings, it shone brighter and longer. A square of paper with fluorescent pigment was glued on top with double-sided tape 3M 9088-200.
The gluing of the glass to the body of the switch was carried out using double-sided adhesive tape with 3M VHB 4910 acrylic adhesive.
The cover was fixed with a screw M 1,4 X 5mm.
The cost of the device was 890 rubles.
Next came the software part. There were no problems. It turns out that TTP223 sensor microcircuits work fine with a stabilized power supply of .3.3v and not very well when powered directly from a well-discharged battery. When starting the device with a power supply around 2.5v, plus after an additional “drawdown” when working out the Mysensors presentation, the TTP223 chip (immediately after calibration) caused the MK to interrupt because it was with an active trigger.
The power supply circuit for the microcircuit was changed (power management TTP223 with gpio MK), additional ground was connected, resistors with higher resistance were replaced on the rgb led lines (which run along the other side of the capacitive sensor board). Also in the software was added: power activation for the capacitive microcircuit after starting the Mysensors framework and working out the presentation. Doubled the delay for auto-calibration of the TTP223 chip when power is applied to it. All these changes completely eliminated this problem.
Before viewing the program code, I recommend getting acquainted with the basic structure of sketches in Mysensors.void before()
{
// Дополнительная функция, если сравнивать со стандартной структурой Ардуино скетчей, то before() это подобие setup(), отработка происходит до инициализации транспортного уровня Mysensors, рекомендуется например для инициализации устройств SPI
}
void setup()
{
}
void presentation()
{
//Тут происходит презентация ноды и ее сенсоров на контролере через маршрутизатор
sendSketchInfo("Name of my sensor node", "1.0"); // презентация названия ноды, версии ПО
present(CHILD_ID, S_WHATEVER, "Description"); // презентация сенсоров ноды, описания сенсоров
}
void loop()
{
}
Test code of the touch switch program:test_sens.ino
/**
ТЕСТОВЫЙ СКЕТЧ СЕНСОРНОГО ВЫКЛЮЧАТЕЛЯ С ПРЕРЫВАНИЯМИ НА NRF_LPCOMP
*/
bool button_flag;
bool sens_flag;
bool send_flag;
bool detection;
bool nosleep;
byte timer;
unsigned long SLEEP_TIME = 21600000; //6 hours
unsigned long oldmillis;
unsigned long newmillis;
unsigned long interrupt_time;
unsigned long SLEEP_TIME_W;
uint16_t currentBatteryPercent;
uint16_t batteryVoltage = 0;
uint16_t battery_vcc_min = 2400;
uint16_t battery_vcc_max = 3000;
#define MY_RADIO_NRF5_ESB
//#define MY_PASSIVE_NODE
#define MY_NODE_ID 30
#define MY_PARENT_NODE_ID 0
#define MY_PARENT_NODE_IS_STATIC
#define MY_TRANSPORT_UPLINK_CHECK_DISABLED
#define IRT_PIN 3 //(PORT0, gpio 5)
#include <MySensors.h>
// see https://www.mysensors.org/download/serial_api_20
#define SENS_CHILD_ID 0
#define CHILD_ID_VOLT 254
MyMessage sensMsg(SENS_CHILD_ID, V_VAR1);
//MyMessage voltMsg(CHILD_ID_VOLT, V_VOLTAGE);
void preHwInit() {
sleep(2000);
pinMode(RED_LED, OUTPUT);
digitalWrite(RED_LED, HIGH);
pinMode(GREEN_LED, OUTPUT);
digitalWrite(GREEN_LED, HIGH);
pinMode(BLUE_LED, OUTPUT);
digitalWrite(BLUE_LED, HIGH);
pinMode(MODE_PIN, INPUT);
pinMode(SENS_PIN, INPUT);
}
void before()
{
NRF_POWER->DCDCEN = 1;
NRF_UART0->ENABLE = 0;
sleep(1000);
digitalWrite(BLUE_LED, LOW);
sleep(150);
digitalWrite(BLUE_LED, HIGH);
}
void presentation() {
sendSketchInfo("EFEKTA Sens 1CH Sensor", "1.1");
present(SENS_CHILD_ID, S_CUSTOM, "SWITCH STATUS");
//present(CHILD_ID_VOLT, S_MULTIMETER, "Battery");
}
void setup() {
digitalWrite(BLUE_LED, LOW);
sleep(100);
digitalWrite(BLUE_LED, HIGH);
sleep(200);
digitalWrite(BLUE_LED, LOW);
sleep(100);
digitalWrite(BLUE_LED, HIGH);
lpComp();
detection = false;
SLEEP_TIME_W = SLEEP_TIME;
pinMode(31, OUTPUT);
digitalWrite(31, HIGH);
/*
while (timer < 10) {
timer++;
digitalWrite(GREEN_LED, LOW);
wait(5);
digitalWrite(GREEN_LED, HIGH);
wait(500);
}
timer = 0;
*/
sleep(7000);
while (timer < 3) {
timer++;
digitalWrite(GREEN_LED, LOW);
sleep(15);
digitalWrite(GREEN_LED, HIGH);
sleep(85);
}
timer = 0;
sleep(1000);
}
void loop() {
if (detection) {
if (digitalRead(MODE_PIN) == 1 && button_flag == 0 && digitalRead(SENS_PIN) == 0) {
//back side button detection
button_flag = 1;
nosleep = 1;
}
if (digitalRead(MODE_PIN) == 1 && button_flag == 1 && digitalRead(SENS_PIN) == 0) {
digitalWrite(RED_LED, LOW);
wait(10);
digitalWrite(RED_LED, HIGH);
wait(50);
}
if (digitalRead(MODE_PIN) == 0 && button_flag == 1 && digitalRead(SENS_PIN) == 0) {
nosleep = 0;
button_flag = 0;
digitalWrite(RED_LED, HIGH);
lpComp_reset();
}
if (digitalRead(SENS_PIN) == 1 && sens_flag == 0 && digitalRead(MODE_PIN) == 0) {
//sens detection
sens_flag = 1;
nosleep = 1;
newmillis = millis();
interrupt_time = newmillis - oldmillis;
SLEEP_TIME_W = SLEEP_TIME_W - interrupt_time;
if (send(sensMsg.set(detection))) {
send_flag = 1;
}
}
if (digitalRead(SENS_PIN) == 1 && sens_flag == 1 && digitalRead(MODE_PIN) == 0) {
if (send_flag == 1) {
while (timer < 10) {
timer++;
digitalWrite(GREEN_LED, LOW);
wait(20);
digitalWrite(GREEN_LED, HIGH);
wait(30);
}
timer = 0;
} else {
while (timer < 10) {
timer++;
digitalWrite(RED_LED, LOW);
wait(20);
digitalWrite(RED_LED, HIGH);
wait(30);
}
timer = 0;
}
}
if (digitalRead(SENS_PIN) == 0 && sens_flag == 1 && digitalRead(MODE_PIN) == 0) {
sens_flag = 0;
nosleep = 0;
send_flag = 0;
digitalWrite(GREEN_LED, HIGH);
sleep(500);
lpComp_reset();
}
if (SLEEP_TIME_W < 60000) {
SLEEP_TIME_W = SLEEP_TIME;
sendBatteryStatus();
}
}
else {
//if (detection == -1) {
SLEEP_TIME_W = SLEEP_TIME;
sendBatteryStatus();
}
if (nosleep == 0) {
oldmillis = millis();
sleep(SLEEP_TIME_W);
}
}
void sendBatteryStatus() {
wait(20);
batteryVoltage = hwCPUVoltage();
wait(2);
if (batteryVoltage > battery_vcc_max) {
currentBatteryPercent = 100;
}
else if (batteryVoltage < battery_vcc_min) {
currentBatteryPercent = 0;
} else {
currentBatteryPercent = (100 * (batteryVoltage - battery_vcc_min)) / (battery_vcc_max - battery_vcc_min);
}
sendBatteryLevel(currentBatteryPercent, 1);
wait(2000, C_INTERNAL, I_BATTERY_LEVEL);
//send(powerMsg.set(batteryVoltage), 1);
//wait(2000, 1, V_VAR1);
}
void lpComp() {
NRF_LPCOMP->PSEL = IRT_PIN;
NRF_LPCOMP->ANADETECT = 1;
NRF_LPCOMP->INTENSET = B0100;
NRF_LPCOMP->ENABLE = 1;
NRF_LPCOMP->TASKS_START = 1;
NVIC_SetPriority(LPCOMP_IRQn, 15);
NVIC_ClearPendingIRQ(LPCOMP_IRQn);
NVIC_EnableIRQ(LPCOMP_IRQn);
}
void s_lpComp() {
if ((NRF_LPCOMP->ENABLE) && (NRF_LPCOMP->EVENTS_READY)) {
NRF_LPCOMP->INTENCLR = B0100;
}
}
void r_lpComp() {
NRF_LPCOMP->INTENSET = B0100;
}
#if __CORTEX_M == 0x04
#define NRF5_RESET_EVENT(event)
event = 0;
(void)event
#else
#define NRF5_RESET_EVENT(event) event = 0
#endif
extern "C" {
void LPCOMP_IRQHandler(void) {
detection = true;
NRF5_RESET_EVENT(NRF_LPCOMP->EVENTS_UP);
NRF_LPCOMP->EVENTS_UP = 0;
MY_HW_RTC->CC[0] = (MY_HW_RTC->COUNTER + 2);
}
}
void lpComp_reset () {
s_lpComp();
detection = false;
NRF_LPCOMP->EVENTS_UP = 0;
r_lpComp();
}
MyBoardNRF5.cpp
#ifdef MYBOARDNRF5
#include <variant.h>
/*
* Pins descriptions. Attributes are ignored by arduino-nrf5 variant.
* Definition taken from Arduino Primo Core with ordered ports
*/
const PinDescription g_APinDescription[]=
{
{ NOT_A_PORT, 0, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // LFCLK
{ NOT_A_PORT, 1, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // LFCLK
{ PORT0, 2, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), ADC_A0, PWM4, NOT_ON_TIMER},
{ PORT0, 3, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), ADC_A1, PWM5, NOT_ON_TIMER},
{ PORT0, 4, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), ADC_A2, PWM6, NOT_ON_TIMER},
{ PORT0, 5, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), ADC_A3, PWM7, NOT_ON_TIMER},
{ PORT0, 6, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // INT3
{ PORT0, 7, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // INT4
{ PORT0, 8, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), No_ADC_Channel, PWM10, NOT_ON_TIMER}, //USER_LED
{ PORT0, 9, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // NFC1
{ PORT0, 10, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // NFC2
{ PORT0, 11, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // TX
{ PORT0, 12, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // RX
{ PORT0, 13, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // SDA
{ PORT0, 14, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // SCL
{ PORT0, 15, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // SDA1
{ PORT0, 16, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // SCL1
{ PORT0, 17, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // TP4
{ PORT0, 18, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // TP5
{ PORT0, 19, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // INT2
{ PORT0, 20, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // INT1
{ PORT0, 21, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // INT1
{ PORT0, 22, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), No_ADC_Channel, PWM9, NOT_ON_TIMER},
{ PORT0, 23, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), No_ADC_Channel, PWM8, NOT_ON_TIMER},
{ PORT0, 24, PIO_DIGITAL, PIN_ATTR_DIGITAL, No_ADC_Channel, NOT_ON_PWM, NOT_ON_TIMER}, // INT
{ PORT0, 25, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), No_ADC_Channel, PWM11, NOT_ON_TIMER}, //RED_LED
{ PORT0, 26, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), No_ADC_Channel, PWM11, NOT_ON_TIMER}, //GREEN_LED
{ PORT0, 27, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), No_ADC_Channel, PWM11, NOT_ON_TIMER}, //BLUE_LED
{ PORT0, 28, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), ADC_A4, PWM3, NOT_ON_TIMER},
{ PORT0, 29, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), ADC_A5, PWM2, NOT_ON_TIMER},
{ PORT0, 30, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), ADC_A6, PWM1, NOT_ON_TIMER},
{ PORT0, 31, PIO_DIGITAL, (PIN_ATTR_DIGITAL|PIN_ATTR_PWM), ADC_A7, PWM0, NOT_ON_TIMER}
};
// Don't remove this line
#include <compat_pin_mapping.h>
#endif
MyBoardNRF5.h
#ifndef _MYBOARDNRF5_H_
#define _MYBOARDNRF5_H_
#ifdef __cplusplus
extern "C"
{
#endif // __cplusplus
// Number of pins defined in PinDescription array
#define PINS_COUNT (32u)
#define NUM_DIGITAL_PINS (32u)
#define NUM_ANALOG_INPUTS (8u)
#define NUM_ANALOG_OUTPUTS (8u)
/*
* LEDs
*
* This is optional
*
* With My Sensors, you can use
* hwPinMode() instead of pinMode()
* hwPinMode() allows to use advanced modes like OUTPUT_H0H1 to drive LEDs.
* https://github.com/mysensors/MySensors/blob/development/drivers/NRF5/nrf5_wiring_constants.h
*
*/
#define PIN_LED1 (16)
#define PIN_LED2 (15)
#define PIN_LED3 (17)
#define RED_LED (PIN_LED1)
#define GREEN_LED (PIN_LED2)
#define BLUE_LED (PIN_LED3)
#define INTERRUPT_PIN (5)
#define MODE_PIN (25)
#define SENS_PIN (27)
/*
* Analog ports
*
* If you change g_APinDescription, replace PIN_AIN0 with
* port numbers mapped by the g_APinDescription Array.
* You can add PIN_AIN0 to the g_APinDescription Array if
* you want provide analog ports MCU independed, you can add
* PIN_AIN0..PIN_AIN7 to your custom g_APinDescription Array
* defined in MyBoardNRF5.cpp
*/
static const uint8_t A0 = ADC_A0;
static const uint8_t A1 = ADC_A1;
static const uint8_t A2 = ADC_A2;
static const uint8_t A3 = ADC_A3;
static const uint8_t A4 = ADC_A4;
static const uint8_t A5 = ADC_A5;
static const uint8_t A6 = ADC_A6;
static const uint8_t A7 = ADC_A7;
/*
* Serial interfaces
*
* RX and TX are required.
* If you have no serial port, use unused pins
* CTS and RTS are optional.
*/
#define PIN_SERIAL_RX (11)
#define PIN_SERIAL_TX (12)
#ifdef __cplusplus
}
#endif
#endif
The switch has a touch button and a tact button on the back of the device. This tact button will be used for service modes, air binding mode, zeroing the device. The button has an iron anti-bounce. The line of the capacitive sensor and the line of the clock button through the Schottky diodes are connected and connected to the analog pin p0.05, also from the capacitive sensor and the clock button there are lines to the MK pins p0.25 and p0.27 to read the states after activating the interrupt on pin p0.05. 0.05. On pin pXNUMX, an interrupt is activated via a comparator (NRF_LPCOMP) by EVENTS_UP. Inspiration for solving the problem received и .
The switch has been added to the Mysensors network managed by the Majordomo smart home controller ()
PHP code to add to the switch's statusUpdate method
if (getGlobal("MysensorsButton01.status")==1) {
if (getGlobal('MysensorsRelay04.status') == 0) {
setGlobal('MysensorsRelay04.status', '1');
} else if (getGlobal('MysensorsRelay04.status') == 1) {
setGlobal('MysensorsRelay04.status', '0');
}
}
See the video for the result
Later, a variant with a boost converter was made, but this is not related to the operation of the TTP223 capacitive microcircuit, there is more desire for a good and uniform backlight when working out pressing for the entire battery life.
See
Project Github —
Russian speaking mysensors
— quick problem solving with Mysensors, tips, tricks, board installation, working with atmega 328, stm32, nRF5 microcontrollers in the Arduino IDE —
Few pictures
Source: habr.com