3148 - 4-Digit Timer Board (6 optional functions)

This 4-digit LED timer comprises a Motherboard and one pre-programmed firmware chip, the 3148T0 Programmable Countdown Timer (1 to 10,000 seconds).

The Motherboard can also be used with 5 other pre-programmed firmware chips, 3148T1 to 3148T5 as described below.

The motherboard does NOT require any modification to accept any of the alternative firmware chips. The only change is the software that we program into the microcontroller. All you have to do is remove one firmware and replace it with another.

You can purchase the pre-programmed add-on firmware individually or as 5-piece pack containing all the other firmware chips listed below. Click on the link to view the product documentation.

1. 3148T1 - Simple Photographic Preset Countdown Timer (60, 90 120, 300, 600 & 900 SECONDS)
2. 3148T2 - Stopwatch with Pause (99H59M59.59S)
3. 3148T3 - 40KHz Auto Ranging Frequency Meter
4. 3148T4 - Programmable Countdown Timer (1-10,000 MINUTES)
5. 3148T5 - Programmable Countdown Timer (1-10,000 HOURS)

Output to transistor (NPN, 100mA @ 30V) for use with a relay board like Order Code 1168. DC IN, RESET, OUTPUT, STOP and START are brought out to a 10-way header strip for easy connection. START and STOP buttons are provided on the board for easy setting-up.

Technical Specifications
Supply	9-12V dc (Order Code PSU445 with connector 778.106)
Current	30 - 50mA max.
Inputs	Start / Stop / Reset (Active low - see documentation)
Output	Open collector NPN transistor, 100mA @ 30V
Display	4-digit 7-segment with decimal point, 14mm RED LED
Board Dimensions	51x66mm
Connections	10 pin SIL header
Product Format	Electronic Kit (KT ) or Assembled (AS) more
Documentation	User Manual (including 3148T0)