Easy 4-digits 7 segment LED Display Hardware Manual Rev 1r0
Wire it on your microcontroller circuit, or hook it up on your PC parallel port, and you ...
Easy 4-digits 7 segment LED Display Hardware Manual Rev 1r0
Wire it on your microcontroller circuit, or hook it up on your PC parallel port, and you will be able to display 4 digit numbers with little programming effort. Also functions as a stand alone digital counter.
FEATURES & SPECIFICATIONS • 5V Power Supply • 2 Available modes (Digit Display mode and Counter mode). • BCD Binary Coded Decimal • Stand alone Digital Counter
Easy 4-Digits 7 Segment LED Display Datasheet Version 1
Figure 2. Easy 4-digits 7 segment LED display JP2 Pin
Figure 3. Easy 4-digits 7 segment LED display JP1 Pins
If the JP2 header pins has a jumper a!ached Table 1. JP1 Pins Pin Descrip!on and fnc!ons to it, you are in ‘Counter Mode’ and to enter the ‘DigPin I.D. Func"on its Display Mode’ just remove the jumper a!ached. GND Ground 5V 5V Power Supply When in digit display mode the JP1 pins D3D3 I/O D0 became binary inputs and the ‘UP‘ and ‘DOWN‘ D2 I/O func"ons will be disabled. D1/UP I/O/Increment D0/DOWN I/O/Decrement Shi#/Clear Shi# register/Clear counter
Easy 4-Digits 7 Segment LED Display Datasheet Version 1
OPERATIONS - DISPLAY MODE & COUNTER MODE Features (Display Mode) Internal 4 stage shi# buffer Internal pull-up resistors (data and control lines) Display numbers 0-9 as well as characters A-E (F is used as instruc"on to display out the content of the 4 buffers 42 frames per second maximum opera"ng speed Display Mode Opera"on The device is in display mode when the jumper mode selector is open. In this mode, the device just wait for a high to low transi"on in the Shi# pin and when it detects a transi"on, its reads D3-D0, shi# it in the 4 stage buffer if it is data (0-9 or A-E) or display the content of the buffers when it receives an F (1111). On power up or upon switching from counter mode to display mode, the display shows 8888 (four 8’s) but the contents of the buffers are all 0’s. This can be proven by sending F (1111) first. Ex: Displaying 1234 to the 4-digit display: 1. Load BCD 1 to D0-D4 then toggle Shi# line.
Easy 4-Digits 7 Segment LED Display Datasheet Version 1
4. Load BCD 4 to D0-D4 then toggle Shi# line.
5. Load F (1111) to D0-D4 then toggle Shi# line.
Features (Counter mode) Up, down and Reset pins Counts from 0000-9999 Internal pull-up resistors (data and control lines) 140 counts per second maximum (see "ming diagram) Counter Mode Opera"on The device is in counter mode when jumper mode selector is close. In this mode, D1, D0 and Shi# pins becomes the Up, Down and Reset pins respec"vely (D3 and D2 has no func"on). To operate the counter, all it needs is a high to low transi"on on any of its pins. One way is to short any pin to ground. Note that the counter is fast and it has no internal debounce protec"on when mechanical contact (switch) is used which can cause mul"ple counts. To avoid this problem, simply add a capacitor (10 – 100 nF typical) to each input pin going to ground or simply parallel to the switch or contact.
