Accessing GPIO pins of Max 3421 IC in USB Host Shield
![USB Host Shield](https://hardwarefun.com/wp-content/uploads/sites/2/2012/09/usb_host_shield-624x180.jpg)
One of my favorite Arduino shield is the USB Host Shield by circuits @ home. Both the hardware and the software of this shield are excellent and well written. I was playing around with the shield by connecting a USB Missile Launcher and had a closer look at the shield. I realized when I had […]