Summertime is summer sale time even at SinoVoip. SinoVoip has a wide range of products to offer: Banana PI series development boards, VOIP products, wireless products and POE switch. Here are some products that are on sale. For more offers from SinoVoip and other manufacturers just visit our store.PCF8591T chip. AD/DA in one module. 8-bit high resolution AD/DA. Compatible with wiringPi