SDA is connected to pin 5 and SCL to pin 6 of the module. Pulling up WP will activate write protection. Pulling up the address pins to 5V will change the I2C address. ĮEPROM chips can be connected directly as well, leaving the address and WP pins open. This standalone library can be downloaded from my repo. The library is part of my Arduino BASIC interpreter ( ) but described here as a standalone solution for use with C/C++ from the Arduino IDE. In addition to this, there is a raw API for buffered direct EEPROM access.ĮEPROM write and read timing is exactly to the data sheet specification without any unnecessary delay() function in the code. Buffering makes the EEPROM reasonably fast and protects it against too many write cycles. EEPROM data is buffered in a small page buffer for read and write. It creates a very primitive file system on the EEPROM which a C-style API. Bytes, numbers or strings can be stored at specific storage location. Most of them address the EEPROM as a big storage array. There are many libraries for serial EEPROM on the market. They work on the I2C bus and only need two pins that they can share with other I2C devices. 4kB and 32kB modules are the most common ones. SD cards need the SPI bus and block pins for other peripherals.Ī low cost alternative are I2C EEPROM modules. Card quality varies and some don't work well on different microcontrollers. Typically buffers sizes of 512 bytes have to be allocated. The disadvantage of SD cards is the large memory footprint of the SD card filesystems. There are a lot of shield on the market for SD cards and a large number of tutorials how to use them. SD cards are a standard way of logging data on an Arduino. When I write, Serial.Println("End"), in the line after Wire.endTransmission() in function nunchuck_init(), it does not display on Serial Monitor.Īlso, it does not display Nunchuck ready on Serial Monitor since it is written after nunchuck_init() has been called.This is a brief tutorial on data storage on EEPROMs for Arduino data logger projects. Return nunchuck_buf // FIXME: this leaves out 2-bits of the data Return ((nunchuck_buf > 1) & 1) ? 0 : 1 // voodoo Return ((nunchuck_buf > 0) & 1) ? 0 : 1 // voodoo returns zbutton state: 1=pressed, 0=notpressed only needed if you use one of the regular wiimote drivers Encode data to format that most wiimote drivers except so we have to check each bit of byte outbuf it also contains the least significant bits for the accelerometer data byte nunchuck_buf contains bits for z and c buttons Int accel_z_axis = nunchuck_buf // * 2 * 2 Int accel_y_axis = nunchuck_buf // * 2 * 2 Int accel_x_axis = nunchuck_buf // * 2 * 2 so we read 8 bits, then we have to add If we recieved the 6 bytes, then go print them Nunchuck_send_request() // send request for next data payload Nunchuck_buf = nunchuk_decode_byte(Wire.receive()) Wire.requestFrom (0x52, 6) // request data from nunchuck Send a request for data to the nunchuck Wire.endTransmission() // stop transmitting Wire.beginTransmission(0x52) // transmit to device 0x52 and tell the nunchuck we're talking to it initialize the I2C system, join the I2C bus, Uses port C (analog in) pins as power & ground for Nunchuckĭelay(100) // wait for things to stabilize Static uint8_t nunchuck_buf // array to store nunchuck data, I am working on a project, syncing Nintendo Nunchuk with Arduino.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |