Hello again!, Can anyone help me in translating different combinations of 6 FSR's (Each FSR corresponds to one of the individual blacked dots in the braille alphabet) into each corresponding letter of the alphabet (Text only). I'm having a hard time translating each combination into letters. Thank you
Hello johnbernardcristobal
Post your sketch, well formated, with well-tempered comments and in so called
code tags "< code >" and a schematic to see how we can help.
Have a nice day and enjoy coding in C++.
int pressureAnalogPins[] = {0, 4, 5}; // Pins where our pressure pads are located
int numPressureAnalogPins = 3; // Number of pressure analog pins
int pressureReading; // Variable for storing our reading
// Adjust these if required.
int noPressure = 2; // Max value for no pressure on the pad
int lightPressure = 50; // Max value for light pressure on the pad
int mediumPressure = 100; // Max value for medium pressure on the pad
void setup(void) {
Serial.begin(9600);
}
void loop(void) {
for (int i = 0; i < numPressureAnalogPins; i++) {
int currentPressureAnalogPin = pressureAnalogPins[i];
pressureReading = analogRead(currentPressureAnalogPin);
Serial.print("Pressure Pad ");
Serial.print(i + 1);
Serial.print(" Reading = ");
Serial.println(pressureReading);
if (pressureReading < noPressure) {
Serial.println(" - No pressure");
} else if (pressureReading < lightPressure) {
Serial.println(" - Light Pressure");
} else if (pressureReading < mediumPressure) {
Serial.println(" - Medium Pressure");
} else {
Serial.println(" - High Pressure");
}
delay(500);
}
}
sorry if i misunderstood your instructions, im only new to robotics and stuff. It only creates an output for the pressure of each FSR. Additionally, i don't know how to create the hardware for translating the outputs of each fsr into letters.
do you have 3 or 6 pads?
Hello johnbernardcristobal
Show a picture of the mechanical interface between FSR and braille system.
i got 6 fsr pads each connected from what i think is called analog pins 0-5
You could create an array of structs representing the pads arrangement an matching letter
(I let you fill in the bit representation so you need to replace all the 0bxxxxxx
/*
bits of the dots are arranged as such in the Braille struct
0 3
1 4
2 5
*/
struct Braille {
uint8_t dots; // 6 dots represented in LSB 0-5 vertically (bit 0 is top left)
char letter;
};
const Braille braille_alphabet[] = {
{0b000001, 'A'}, // ⠁
{0b000011, 'B'}, // ⠃
{0bxxxxxx, 'C'}, // ⠉
{0bxxxxxx, 'D'}, // ⠙
{0bxxxxxx, 'E'}, // ⠑
{0bxxxxxx, 'F'}, // ⠋
{0bxxxxxx, 'G'}, // ⠛
{0bxxxxxx, 'H'}, // ⠓
{0bxxxxxx, 'I'}, // ⠊
{0bxxxxxx, 'J'}, // ⠚
{0bxxxxxx, 'K'}, // ⠅
{0bxxxxxx, 'L'}, // ⠇
{0bxxxxxx, 'M'}, // ⠍
{0bxxxxxx, 'N'}, // ⠝
{0bxxxxxx, 'O'}, // ⠕
{0bxxxxxx, 'P'}, // ⠏
{0bxxxxxx, 'Q'}, // ⠟
{0bxxxxxx, 'R'}, // ⠗
{0bxxxxxx, 'S'}, // ⠎
{0bxxxxxx, 'T'}, // ⠞
{0bxxxxxx, 'U'}, // ⠥
{0bxxxxxx, 'V'}, // ⠧
{0bxxxxxx, 'W'}, // ⠺
{0bxxxxxx, 'X'}, // ⠭
{0bxxxxxx, 'Y'}, // ⠽
{0b110101, 'Z'}, // ⠵
};
you read the pads and build a byte in the same order using bit manipulations macros bitSet() when the sensor is activated and then walk the array to find a match
3 Likes
I would assign a binary number position to each dot. This would take only 6 binary bits.
For instance if the locations are numbered:
1 2
3 4
5 6
Then V would be
123456 <- only for ease of counting positions
101011
O would be:
123456
100110
etc
Smart ;)…
Hello, how would i input these binary numbers into the code given by @J-M-L ? do i simply replace the 0bxxxxxx? thank you
That’s what I suggested - just a different order for the pads (in case you had only a vertical reader with 3 sensors)
Each dot is a one and a space is a zero
1 Like
{0b100110, 'O',
{0b101011, 'V'},
etc
My intention is to map the pins to a binary position. Where @J-M-L Suggested assigning sequential numbers to the alphabet.
Not sure if either has a benefit over the other.
1 Like
got it, thank you so much
Nope… read again my proposal
You might have been confused because A and B have one dot and then two dots.
The vertical numbering is common - see Braille Alphabet - Braille Works
Wasn't confused, I just assumed a different "pinout" than you.
Ok.. then I ma confused by what you think my proposal was.. there was no sequential number in my proposal
You are likely correct. I was thinking there may be a way to make the "decoding" easier / faster depending on how there were defined. However with a little google I read some combination of letters have different patterns. So I stopped thinking about it.
Sure it was the same suggestion, just different bit ordering . Hence why I’m confused.
Anyway no big deal