Design Scheme of Smart Phone Remote Control TV

0 Introduction

With the popularity of smart phones and TV sets, it is inevitable to use the Wi Fi function of smart phones to remotely control TV sets. Because in China's urban population, basically every person has a smart phone, and the smart phone is carried with him, but the remote control of the TV is not carried with him. It is often difficult to find the remote control of the TV when turning on the TV or changing channels. If you use a smart phone to remotely control the TV, then this problem does not exist.

1 hardware circuit design

Although smart phones and most TV sets have Wi Fi, the Wi Fi of TV can not realize the Wi Fi link with smart phones, because the TV can not load additional Wi Fi applications, so the smart phone can not "extra" control the Wi Fi of TV. However, smart phones can load "extra" applications to achieve Wi Fi control. Therefore, how to make the TV receive the Wi Fi control of smart phone is the key to realize this control. At present, all TV sets have infrared remote control function. Using this function, the infrared receiving circuit of the TV set is removed, and a Wi Fi receiving to TTL control circuit is connected. The control transmitted to the TV set is the infrared remote control coding signal, so the smart phone can use Wi Fi to remotely control the TV set. Although the infrared remote control circuits of various TV sets are different, the principle is the same. In this paper, Hisense led55k560x3d TV is designed as an example. The definition of the interface socket between its infrared remote control circuit and TV is shown in Figure 1.

Figure 1 definition of socket interface of led55k560x3d TV infrared remote control circuit

In Fig. 1, IR is the infrared control signal sent to the TV by the TV infrared remote control receiver. GND is a common signal. Standby is the TV standby / power on signal from the TV to the infrared remote control receiver. When the TV is in standby, the signal is high; When the TV is turned on, the signal is low 5V is the 5V power supply provided by the TV to the infrared remote control receiver. Other pins are undefined.

According to the signal definition in Fig. 1, the control circuit of TV Wi Fi to TTL signal shown in Fig. 2 can be constructed.

Fig. 2 control circuit of Wi Fi to TTL signal

In Figure 2, the oca4004 chip of American Qualcomm company is used as the main chip to form this control circuit. Because oca4004 is a Wi Fi chip with CPU, embedded IEEE802.11 A / B / g / N protocol and supporting internet work. It not only has simple and reliable peripheral circuit composition, but also can embed secondary development programs without adding MCU, ROM and ram circuits.

In order to keep the main control circuit of the TV unchanged and the interface with the infrared remote control of the TV unchanged, the original hx1.25-9p-l-k socket is adopted, and the definition of its signal pin is not changed. The standby signal standby circuit of the original infrared remote control receiving circuit is also designed according to the original circuit. The change here is that a resistor R1 is added to the collector of triode V1 to introduce the standby signal into oca4004 for start-up / standby detection. All infrared receiving and processing circuits are removed and replaced with Wi Fi transceiver circuit with qca4004 as the core. The Wi Fi signal processing program is added to convert the control signal into the corresponding infrared remote control code. The voltage amplitude is converted through the triode V2 and sent to the TV main control board to realize the Wi Fi remote control of the TV.

Design Scheme of Smart Phone Remote Control TV 1

smart phone remote control TV related articles
Back to School Help!Read Details! Get 10Points For1 with Best Outfit!?
Design Scheme of Multi-channel Voltage Measurement Based on Stm32
How Does Temperature Affect the Speed of Sound?
What Is WiFi? Just Tell Me What It Is, and What It's Used For.?
Which Is Better, WiFi Or ZigBee Wireless Technology

KingBird Home Furniture