Check validity of credit card number

Record bowling score/pin location, show pin statistics, export to CSV files

Refresh files in SDcard and make it visible in PC

Permanently delete photos and prevent file recovery

Record solve time. Best time and average time are shown

Record bowling score/pin location, show pin statistics, export to CSV files

Collection of 555 circuit, RC,RL,LC filter, resistor ratio, R in parallel/series

Record bowling score/pin location, show pin statistics, export to CSV files

Use adjustable voltage regulator ; calculate the components value

Calculation of astable and monostable circuit

Find out combination of resistors in series/parallel making a desired resistance

Say goodbye to paper-based target score sheets!

Use adjustable voltage regulator ; calculate the components value

Solve 2 or 3 linear equations, load equations from CSV

List R, C making desire time constant / cutoff frequency

Log or parse NMEA sentences

Code wizard generating C code and 21 demo projects

65536 is a more addictive puzzle game than 2048

GPS logging with running, walking, biking, driving activities

Adding archery scores

Calculate Ohm's Law

Keep tracks of income and expense

Log accelerometer data to csv file with minimum and maximum are calculated

Find out combinations of L and C making a desired resonant frequency