CuHead WiFi shield Version 2.0! It has the EEPROM that can be used to store the webpages, it also has the batterty charging components populated.
This is the shield you need to get Wi-Fi connectivity to your Arduino-based project! This shield provides 802.11b connectivity and is a direct drop-on plug-and-play solution to your Arduino Diecimila/Duemilanove.
The second revision of this board has all the components in surface mount form. The new and exciting feature of the second revision of this board is the addition of a 16Mbit serial flash for storing web pages and other data! This additional storage space can be used for storing more complex and feature rich webpages, as well as sensor type data to be downloaded at a future time.
- Add-on shield built for Arduino Diecimila, Duemilanove and Uno R2/R3
- Dimensions, shape, even color match exactly!
- True plug-n-play solution
- Uses SPI for host communication (max speed 25MHz)
- All Arduino headers brought out for easy access
- Easy access reset button on-board
- On-board PCB antenna
- Switchable interrupt pin usage between INT0 and digital pin 8
- Switchable LED on digital pin 9
- Switchable CS pin for serial flash between digital pin 10 and digital pin 7
Cuhead V2.0 has charging and discharging function, the charging circuit is used to tell voltage of the battery.
We can connect the positive and negtive of the battery to BAT, if the battery is full, then Cuhead V2.0 wont charge battery; if it is not, the external battery will be charged.
We bring comparator to check the operating current of Cuhead V2.0 so you know it is Arduino giving power to Cuhead V2.0 or the opposite way, and change the charging circuit to connect/disconnect based on that.
When Cuhead V2.0 connect Arduino, there are two working status：
- Connect Arduino with USB/Adaptor , Arduino gives power to Cuhead V2.0, the charging circuit on Cuhead V2.0 will disconnect；
- No external power for Arduino, then the charging circuit of Cuhead V2.0 is working, and the battery will power the boards. Normally we give power to Arduino directly, thus the charging circuit is inactive.