![]() Tap the Menu icon (upper-right) then tap Settings. If not available, swipe up or down from the center of the display then tap the Phone Phone icon. From a Home screen, tap the Phone icon (lower-left). These encoded data can be stored and processed in a microcontroller to perform different tasks. DTMF tones are used by automated dial-in systems such as Voicemail or where prompts are used to navigate. ![]() So, knowing how are DTMF tones generated can surely be an interesting bit of info. Button Low DTMF frequency (Hz) High DTMF frequency (Hz) * 941 1209 # 941 1477 Low and high frequencies of each button ConclusionĭTMF signals can be transmitted over the radio to switch ON or switch OFF home appliances, flashlights, motors, cameras, warning systems, irrigation systems, and so on. The frequencies generated on pressing different phone keys are shown in the Table. Each button lies at the intersection of the two tones. The frequencies generated on pressing different phone keys are shown in the table Frequency 1209 Hz 1336 Hz 1477 Hz 697 Hz 1 2 3 770 Hz 4 5 6 852 Hz 7 8 9 941 Hz * 0 # Dual-frequency for each keyĮach row and column of the keypad corresponds to a certain tone and creates a specific frequency.
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