Chengyu Barcode / 2011-11-25When it comes to the word " barcode ", quite a few people will not understand its meaning, and even feel it is unpopular. In fact, barcode is a universal business language,
To make a stable gateway, we start from the abnormal scenario problem. To make a communication gateway DEMO, it takes about one month. To make a stable gateway, it may take several years. We started t
I bought a SIM900A module from Taobao. The USB-TTL uses the PL2303HK chip. My question is: Why is it so easy to lose connection after registering after inserting the Unicom SIM card?
In the past few years, due to the rapid development of smartphones, wearable devices, and the Internet of Things, especially the popularity of TWS Bluetooth headsets in the past two years, the develop