The Nexx 3020H is a great OpenWRT device. * 400MHz RAMIPS CPU * 64MB RAM * 8 MB SPI flash * USB A port * dual 100Mbit ethernet * 2.4GHz 802.11n 2T2R (300M

The Nexx 3020H is a great OpenWRT device. * 400MHz RAMIPS CPU * 64MB RAM * 8 MB SPI flash * USB A port * dual 100Mbit ethernet * 2.4GHz 802.11n 2T2R (300Mbit claimed) There's even a Chinese build of u-boot that has a web interface for directly flashing the mtd partition that OpenWRT is on, so it essentially becomes unbrickable from bad OpenWRT builds. You can buy them from AliExpress for around $14.50 USD in single quantity with free shipping. They don't have any GPIO to speak of (except internal UART pads) but for that price, just buy a cheap Arduino/STM/PIC board and hook it up through USB to the 3020H for all the I/O you need.