3154 - 4-Digit Pre-Settable LED Down Counter

Low cost microcontroller based 4 Digit Pre-settable LED Down Counter with four operating modes that controls how the output behaves when count reaches zero. Can be used for both low (30cps) and high (4100cps) speed applications.

Accepts inputs from any 'make' contact so can be used with pulses from switches, relays, open collectors outputs or simply push buttons.

Two onboard push button switches (SET and INC) are used to preset the starting count and select the operating mode.

Inputs for Count, Rate (debounce) and Reset (to preset value). Output is an open collector transistor (NPN, 100mA @30V). The four operating modes are detailed in the User Manual (see Technical Specifications table below).

Count, Reset, Rate, Output and Power In are brought out to a 10-way header strip for easy connection. The board has Power In reverse polarity protection.

Technical Specifications
Supply	Regulated 12Vdc (Order Code PSU446 with connector 778.106)
Current	20 - 50mA max.
Operating modes	Count Stop, Output Hold Over-Count, Output Hold Auto-Reset, One-Shot Output Over-Count, One-Shot Output
Count range	0000 to 9999 (10,000 max)
Count speed (selectable)	Low: 30 cps (15mS high, 15mS low) High: 30,000 cps (measured)
Inputs	Reset / Count / Rate
Input trigger	'Make' contact e.g. switches, relays, open collector outputs or simply push buttons
Output Type	Open Collector Transistor, NPN, 100mA @ 30V (see Help Sheet)
Display	4-digit 7-segment with decimal point, 14mm RED LED
Board Dimensions	51x64mm
Connections	10 pin SIL header
Product Formats	SELF-ASSEMBLY Electronic Kit (KT ) or PRE-ASSEMBLED Electronic Module (AS) more
Documentation	User Manual

• The pre-programmed firmware chips supplied with the kit or assembled formats below can also be purchased separately - CLICK HERE for details.